Rejection may cause increased sensitivity, redness, pain and worsening vision.

CNN: Fuchs' dystrophy

In one study, young breast cancer survivors reported skin sensitivity, vaginal dryness, genital pain, premature menopause, fertility issues and extreme fatigue.

CNN: Let's talk about sex ... and cancer

Symptoms of fungal meningitis can include headache, fever, nausea, stiff neck, new weakness or numbness anywhere in the body, slurred speech, pain or swelling at the injection site and sensitivity to light, according to the CDC.

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The second group of patients, categorized as having nonceliac gluten sensitivity, have the same symptoms of abdominal pain, bloating, gas and diarrhea, but do not have antibodies or the genetic predisposition for celiac disease.

CNN: Are there degrees of gluten sensitivity?