Listing conditions

Displaying 551 - 600 of 801 in total

Pancreatic cancer
A malignant transformation of the tissues of the pancreas, an organ that helps with digestion. These cancers often present with symptoms late in their stage.
Panic attack
A psychiatric condition marked by sudden feeling of intense fear or apprehension, lasting minutes to hours, often involving physical symptoms such as rapid breathing, heart palpitations, sweating, and trembling. There is a genetic component, and episodes can be brought on for a number of reasons. Attacks are typically not dangerous, but are often confused for heart attacks.
Panic disorder
A psychological condition marked by recurrent panic attacks (a state of fear and physical symptoms including fast heart beat, fast breathing, and often chest pain). Symptoms can mimic a heart attack, and a medical cause should be ruled out on the first attack.
Parasitic disease
Any infection caused by a parasite, a term used to describe a variety of organisms that require a host (such as humans) to survive. The term typically does not refer to infection by bacteria, viruses, or fungi. Examples include malaria, head lice, and tape worm.
Parathyroid adenoma
A noncancerous tumor of the parathyroid glands, structures located in the neck that regulate how the body uses calcium. This often leads to hyperparathyroidism, a condition in which there is too much of the parathyroid hormone, leading to increased calcium levels. It may require surgical removal.
Parkinson disease
A disease caused by reduced dopamine in the brain. Dopamine is a molecule important for initiating and controlling movement. People with this disease may shake in a particular way, have difficulty initiating movement, and may walk in a "shuffling" manner.
An infection of the folds of tissue around the finger or toe nails. It can be caused by either bacteria or fungi, and can come on suddenly or be long-standing. It is often caused by trauma to the nail folds, such as finger biting or improper nail trimming.
Paroxysmal supraventricular tachycardia
A condition leading to recurring episodes of increased heart rate due to signals that arise from the upper chambers of the heart. It is due to a problem in the electrical system in the heart in which an extra pathway for the electrical signal exists.
Paroxysmal ventricular tachycardia
Periodic episodes of suddenly rapid heart beat that originate in the lower chambers of the heart. These abnormal heart rhythms can be life threatening and require prompt evaluation and treatment. This condition is fairly rare and typically occurs only in people with some sort of underlying heart abnormalities.
Patau syndrome
A genetic disorder, present from birth, characterized by heart defects, physical deformities, intellectual disability, extra fingers, and many other problems. It is caused by an extra copy of chromosome 13. It is associated with advanced maternal age at time of pregnancy.
Pelvic fistula
An abnormal connection formed between organs of the pelvis (e.g. rectum, vagina, bladder, uterus), most often used to describe these problems in women. This can lead to numerous uncomfortable symptoms and risk of infections. It is often caused by prolonged labor (i.e. childbirth) or as a complication of certain surgeries.
Pelvic inflammatory disease
Inflammation of the female reproductive organs, including the uterus, fallopian tubes, and ovaries. The most common cause is sexually transmitted diseases, though there are many other causes. Complications if untreated include scarring that can lead to infertility.
Pelvic organ prolapse
A condition in which a portion of the internal vaginal canal is collapsed and often sticks out of the vaginal opening. It is caused by one of the pelvic organs (typically the uterus, bladder, or rectum) slipping through a weakness in the pelvic floor that normally holds them in place and pushing on the vagina.
A group of blistering disorders of the skin and mucous membranes, caused by the immune system attacking certain proteins in the skin. There are several forms, pemphigus vulgaris is the most common.
An inflammation of the pericardium, a fibrous sac surrounding the heart. It is often caused by infections, kidney failure, heart attacks, or certain auto-immune disorders. If not treated, fluid can collect around the heart, constricting it, leading to a life threatening condition known as cardiac tamponade.
Peripheral arterial disease
A partial obstruction of blood flow in the arteries of the body. It is usually the result of plaque buildup similar to the process in coronary artery disease. Cool extremities and claudication (pain with muscle use) are often symptoms.
Peripheral arterial embolism
A piece of material in the blood that has traveled through the circulatory system and become lodged inside of an artery, interrupting blood flow to part of the body. One common such material is a blood clot, often forming inside of the heart (especially in patients with atrial fibrillation). If not treated, this can cause permanent damage to the organs and tissues.
Peripheral nerve disorder
Malfunction of nerves, most commonly in the legs. Both strength and feeling can be affected, leading to weakness, numbness, and pain. This disease can be genetic, but is also caused by diabetes, chemotherapy side effects, and certain infections.
Perirectal infection
An infection of the skin and soft tissues around the rectum and anus (the lowest part of the bowels, through which feces leaves the body). These infections are often in the form of an abscess, or collection of pus. If not treated, this can lead to serious consequences. The cause is often unknown.
Inflammation of the peritoneum, the thin tissue lining the inner wall of the abdominal cavity and covering the abdominal organs. This is often due to either a hole in one of the organs of the digestive tract (e.g. ruptured appendix), or from a puncture of the abdomen (e.g. stab wound, surgery). This can lead to inflammation due to infection or irritation. It can occur without a clear cause as well.
Peritonsillar abscess
A collection of pus next to the tonsils in the back of the throat. This is often a complication of a tonsil infection (most commonly "step throat"), and is a medical emergency.
Persistent vomiting of unknown cause
Recurrent vomiting that will not go away for a significant amount of time and for which a cause has not been determined despite adequate workup by a physician.
Personality disorder
A mental disorder in which a person consistently demonstrates thought patterns or behaviors that are not appropriate in society and lead to problems in life.
Peyronie disease
A disease marked by chronic inflammation and scar tissue formation in the tunica albuginea, the fibrous structure that surrounds the erectile tissues in the penis. This can cause curvature of the penis and make sexual intercourse very painful. The cause is poorly understood.
Inflammation of the throat, commonly known as a "sore throat." It can be caused by a variety of viral infections such as the common cold or flu, as well as certain bacteria such as those causing "strep throat."
A condition in males in which the foreskin cannot be pulled back over the glans penis (i.e. the "head of the penis"). This is normal in children and adolescents, but abnormal in adults. Causes include a variety of skin conditions that lead to inflammation or scarring.
Pick disease
A rare disease leading to progressive destruction of the nerves in the brain, leading to loss of speech and dementia. The cause is not known.
Pilonidal cyst
Development of an abnormal pocket of skin containing debris of hair and skin, typically above the tailbone. It is often initially caused by irritation due to an ingrown hair. Treatment includes antibiotics, warm compresses, creams, and possibly surgical excision.
A condition in which the conjunctiva (the thin outer membrane covering the eye) begins to degenerate. The cause is not known, though it is typically not dangerous and usually does not require treatment.
Pinworm infection
An infection caused by a pinworm (a thin, white, intestinal worm). Female pinworms lay eggs on the skin around the anus, leading to itchiness. It is caused by swallowing a pinworm egg from a contaminated area. It is very contagious, and often the entire household is treated.
Pituitary adenoma
Noncanceorus tumors of the pituitary gland, a structure in the brain responsible for producing a variety of vital hormones. Some tumors lead to decreased hormone production, whereas other secrete hormones. In both cases, this can lead to severe disease, and may require surgical removal.
Pituitary disorder
Any problem with the pituitary gland, a structure in the brain that produces many important hormones. Most pituitary conditions are due to growths in or near the pituitary gland, either cancerous or not. These conditions can lead to increased or decreased growth, problems with blood pressure, headaches and many other issues.
Pityriasis rosea
A type of skin rash that typically arises after an upper respiratory tract infection such as the common cold or flu. It commonly starts as a large oval red patch on the abdomen followed by smaller red spots throughout the body. The exact cause is unknown, though it usually resolves on its own.
Placental abruption
A complication of pregnancy in which the placenta, the structure that nourishes the fetus (i.e. growing baby) peels aways from the uterus (i.e. the womb), causing the fetus to be without oxygen and the mother to suffer from heavy bleeding. This is a medical emergency. The cause is often unknown.
Placenta previa
A problem of pregnancy in which the placenta, the structure that supports and nourishes the growing fetus, is attached to the lowest part of the womb, thus covering the opening to the cervix (leading to the birth canal). This can lead to sudden vaginal bleeding. The cause is unknown.
A deadly infectious disease caused by the bacteria Yersinia pestis. It can be spread by air, direct contact, or contaminated foods. It has been responsible for numerous epidemics throughout history, often known as the "black plague" or "bubonic plague." It can be successfully treated if caught early, and is now rare in most parts of the world.
Plantar fasciitis
A painful condition due to damage to the thick connective tissue supporting the arches under the feet. It is typically caused by overuse and sports-related injuries. Symptoms are often relieved with rest and conservative therapy.
Pleural effusion
A condition in which too much fluid builds up in the space that surrounds the lungs. Some of the causes include infections, heart failure, cancers, and auto-immune conditions.
A disease of the lung caused by long-term exposure to inhaled dust, often from mines. There are many different forms, depending on what type of dust was inhaled. These include: coal, asbestos, silica, cotton, and many others.
An inflammation of the tiny air sacs inside of the lungs. It can be caused by an infection (bacterial, viral, or fungal), drugs, or certain conditions in which the person's own immune system attacks the lungs.
An abnormal collection of air in the space between the lungs and the chest wall. Potentially life threatening, this can lead to difficulty breathing, lung collapse, or low blood pressure. It can occur on its own in certain people (especially with prior lung disease) or after injury (e.g. surgical intervention or gunshots).
Poisoning due to analgesics
An overdose of pain relieving medications. Depending upon the exact medication, the symptoms vary, though they can all be life-threatening. Common pain relievers include opiates (e.g. codeine, hydrocodone), ibuprofen (e.g. Advil), acetaminophen (e.g. Tylenol), and aspirin.
Poisoning due to anticonvulsants
An overdose of anti-seizure medications. Depending upon the exact medication, the symptoms vary, though they can all be life-threatening. Common anti-seizure medications include Keppra (i.e. levetiracetam), Tegetrol (i.e. carbamazepine), Zarontin (i.e. ethosuximide), Lamictal (lamotrigine), etc. Anticonvulsants can also be used to treat mood disorders and neuropathic pain.
Poisoning due to antidepressants
An overdose of medications used to treat depression. Depending upon the exact medication, the symptoms vary, though they can all be life-threatening. Common antidepressants include SSRI's (e.g. Prozac, Zoloft), tricyclics (e.g. amitriptyline, doxepin), MAOI's (e.g. phenelzine, selegeline), etc. Antidepressants may be used for a variety of conditions, including anxiety, Parkinson's disease, obsessive compulsive disorder, etc.
Poisoning due to antihypertensives
An overdose of medications used to treat high blood pressure. Depending upon the exact medication, the symptoms may very, but overdose of all can lead to dangerously low blood pressure. Common types of blood pressure medications include diuretics (i.e. "water pills," such as HCTZ), ACE inhibitors (e.g. lisinopril), beta blockers (e.g. losartan), calcium channel blockers (e.g. amlodipine).
Poisoning due to antimicrobial drugs
Damage to the body due to too much of or a bad reaction to antimicrobials (medicines that treats infections). Depending upon the exact medication, the symptoms vary, though they can all be life-threatening. Antimicrobials include antibiotics, antivirals, antifungals, and antiparasitics.
Poisoning due to antipsychotics
An overdose of medications used to treat pyschoses (diseases causing a loss of contact with reality, such as schizophrenia). Depending upon the exact medication, the symptoms vary, though they can all be life-threatening. Common anti-psychotic medications include chlorpromazine, haloperidol, aripiprazole (i.e. Abilifty), Risperidone (i.e. Risperdal), and Quetiapine (i.e. Seroquel).
Poisoning due to ethylene glycol
A potentially deadly poisoning often from drinking automotive antifreeze. This can be treated if caught immediately.
Poisoning due to gas
Excessive exposure to a toxic gas, leading to bodily harm and potentially life-threatening conditions. Gasses that can lead to poisonings include carbon monoxide (e.g. from fires, cars left running in closed environments, damaged heating systems), chlorine gas (e.g. mixing bleach and vinegar), sarin gas (used in bioterrorism), etc.
Poisoning due to opioids
An overdose of the pain relieving medications or street drugs known as opiates. These include heroin, codeine, hydrocodone, oxycodone, and many others. Symptoms of overdose include confusion, coma, small pinpoint pupils, and slowed or even stopped breathing. This is a medical emergency.
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