Thumb sucking is a behavior found in humans, chimpanzees, captive Ring-tailed Lemurs, and other primates. It usually involves placing the thumb into the mouth and rhythmically repeating sucking contact for a prolonged duration. It can also be accomplished with any piece of skin within reach (such as the big toe) and is considered to be soothing and therapeutic for the person. As a child develops the habit, it will usually develop a "favorite" finger to suck on.Source: Wikipedia
Within all the people who go to their doctor with thumbsucking, 91% report having preoccupation with sex, 91% report having wrist cramps or spasms, and 91% report having joint cramps or spasms.
Patients with thumbsucking often receive corneal transplant, transurethral resection of prostate (turp), coronary thrombolysis, control of epistaxis, ct scan abdomen, procedures on spleen, bone marrow transplant and removal of ectopic pregnancy .
The most commonly prescribed drugs for patients with thumbsucking include chlorpheniramine / phenindamine / phenylpropanolamine, air, mecamylamine, troleandomycin, indium oxyquinoline in-111 (indium in-111 oxyquinoline), pipecuronium (arduan), grepafloxacin (raxar), rabbit anti-human t-lymphocyte globulin (thymoglobulin), iopanoic acid, conjugated estrogens topical, malathion topical, gemtuzumab (mylotarg) and norelgestromin (ortho evra) .
Groups of people at highest risk for thumbsucking include race/ethnicity = other, age 30-44 years, race/ethnicity = hispanic, age 75+ years, age 60-74 years, age 5-14 years, age 1-4 years, race/ethnicity = black, age 15-29 years, age 45-59 years and age < 1 years.