The immune system abnormally responding to something you ate, touched, or were bitten by; typically appears as skin rash, runny nose, itchiness, red or swollen eyes, throat swelling, etc.
Lack of vision or inability to see, either totally (no perception of light) or partially (able to see some blurred light but not discrete objects), either in all or part of your field of vision
Feeling a heartbeat or pulse that is slower than usual. By definition, a heartbeat under 60 beats per minute is slow (though not necessarily dangerous)
Seeing, hearing, or feeling things that others cannot or that do not exist (e.g. hearing voices); or, having strong beliefs that no one else believes (e.g. people out to get you, people reading your thoughts)
A long-standing feeling of lowered mood (e.g. "sad" or "worthless") or elevated mood (e.g. "giddy" or "on top of the world"), as well as strange (e.g. seeing or hearing things that others don't) or disordered thoughts
Often described as "shortness of breath," this is the feeling of not getting enough air and needing to breath harder or faster, sometimes accompanied by sounds such as wheezing
Any change in eye movements, including "ticking" when moving eyes in a specific direction, both eyes not being properly aligned with each other, or easy fatigue when moving eyes
A brief loss of consciousness (i.e. "passing out"); fainting is usually the end result of not enough blood reaching the brain, the cause of which may vary
The feeling that your heart is fluttering, skipping a beat, or beating either too hard, too fast, or with an abnormal rhythm; this may be felt on its own or when checking your pulse or putting a hand on your chest
Decreased amount of urine produced over the past day or longer; may notice decreased frequency of urination, decreased amount of urine when urinating, or very dark yellow urine
Dark or black, thick, and sticky appearing stool that is often foul smelling and associated with certain types of bleeding; often described as looking like tar
An unpleasant feeling or discomfort (e.g. throbbing, sharp, achy) felt in the eye or eye socket. Often feels worse with eye movement or when focusing on objects
Any health complications related to pregnancy experienced during pregnancy (including, miscarriage, gestational diabetes, maternal high blood pressure, early labor, vaginal bleeding)
Caused by abnormal electrical activity in the brain, seizures often present as a blackout along with uncontrollable shaking, stiffness, or jerking of part or all of the body, though symptoms may vary widely
Unpleasant or unusual sensations felt on the body (e.g. tingling, numbness, crawling, "pins and needles," electric sensation) or changes in smell or taste (e.g. loss of smell or taste, or regularly experiencing unusual smells or tastes)
A feeling of not getting enough air or breathing unusually fast for the level of activity in which you are currently engaged (e.g. severely out of breath after climbing just a few stairs)
Light bleeding from the vagina that is not during or different than your usual menstrual periods; may often appear as small pink or brown stains on underwear or pad
During pregnancy, a feeling of hardness in the belly that comes and goes due to tensing of uterine muscles, often in a wave-like pattern; may be normal or a sign of upcoming childbirth
Any bleeding from the vagina that is not the same as your normal "period" or "menstrual cycle"; blood found on underwear may often be due to vaginal bleeding
Any recent change in normal sight, including double vision, blurred vision, tunnel vision, partial or total blindness, colorblindness; or seeing unusual objects in your visual field, such as halos, bright dots, translucent waves, zig-zags, etc.
Vomiting (i.e. "puking" or "throwing up") up stomach contents that are either fully blood, streaked with blood, containing clots of blood (appear as clumps of solid red or black jelly), or have the appearance of coffee grounds
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