11Reverse anorexia
There are people who suffer from something called “reverse anorexia” which causes (primarily) men with already muscular bodies to feel too small.
12Tuberculosis
Tuberculosis was so romanticized during the Victorian era that fashion trends emerged to highlight and emulate the symptoms of the disease. This fashion movement is referred to as “Consumptive Chic”.
13Silent Migraines
Silent Migraines are migraines that have no pain, but people experiencing them can have vision loss, flashing lights, and wavy lines in the vision, and hallucinations.
14Dandruff
Dandruff is caused by a fungus that uses lipase to digest lipids, so it lives in areas with many sebaceous glands. The lipases break down skin, as well, and when the fungi grow too fast, larger flakes of skin (dandruff) come off as the epidermis is replaced from the levels below.
15Sickle-cell anemia
Sickle-cell anemia protects the carrier from malaria, which is why it is seen mostly in people of African descent.
16Kidney stones
Kidney stones can grow until they fill up all the crevices in your kidneys and resemble deer antlers; they're called staghorn stones
17Dyslexia
Dyslexia isn't characterized by the reversal of letters or words and mirror writing. It's a disorder of people with at least average intelligence who have difficulty spelling words, reading quickly, writing words, sounding words out, pronouncing words read aloud, understanding what they read.
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18Heartburn
Heartburn actually has nothing to do with the heart at all. It occurs when the sphincter muscle at the end of the esophagus abnormally relaxes and fluids from the stomach, such as stomach acid and bile, flow back up into the esophagus. It is more likely to happen when bent over or lying down.
19Crohn's disease
Complications of Crohn's disease include fistulas between your gut and several abdominal organs, resulting in passing gas and feces into places like your skin, urine, or vagina.
20Flu
The flu presents as asymptomatic 75% of the time in otherwise the young and healthy, and yet is still highly contagious and deadly to vulnerable populations.