These conditions often go undiagnosed because their symptoms—such as exhaustion, fever, weight gain and joint pain—are commonplace and vague. If your doctor is unclear about what ails you, be sure he has checked you for:
Lyme disease, a systemic bacterial infection transmitted by a tick bite.
Celiac disease, in which gluten (a protein in wheat, barley and rye) harms the intestines during digestion and leads to nutritional deficiencies.
Lupus, an autoimmune disease that causes inflammation and damage in many organs in the body.
Hypothyroidism, a condition in which the thyroid gland doesn’t produce a sufficient quantity of a critical hormone.
Narcolepsy, a nervous system disorder in which the brain makes too little of a crucial protein, leading the sufferer to suddenly fall asleep in the daytime.
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