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In most cases, the cause of flat feet (also called pes planus) is unknown. Possible causes or contributors to the condition include:

• Genetic disorders (such as Marfan’s syndrome or Down’s syndrome)

• Tendon abnormalities or injury in the ankle and foot

• Developmental abnormalities, such as incomplete separation of the bones in the foot and ankle

• Aging

• Obesity

• Rheumatoid arthritis

Folliculitis is the medical term for inflamed hair follicles. The inflammation can be caused or complicated by an infection or have a non-infectious cause. In addition to bacterial folliculitis, fungi and herpes simplex viruses can also infect hair follicles. A condition called eosinophilic folliculitis is non-infectious cause, which occurs primarily in immunocompromised people. Conditions that can mimic folliculitis and/or predispose a person to folliculitis include impetigo, eczema and psoriasis.

Diagnosis of lymphoma starts with the doctor asking about your symptoms and doing a physical exam. Your doctor will check for swollen lymph nodes and organs throughout your body. If your doctor suspects lymphoma, he or she will order blood tests to check the numbers and appearance of your blood cells (red cells, white cells and platelets). Sometimes the diagnosis can be made with a special blood test called flow cytometry. This test is a way to sort and identify the different types of cells in the blood, including cancerous lymph cells. Your doctor will likely recommend a lymph node biopsy to confirm the diagnosis.

Irritable bowel syndrome (IBS) usually starts in early adulthood. It affects twice as many women as men. Approximately 10% to 20% of the population has IBS. No one knows what causes IBS. Some studies suggest that the nerves of the colon may be much more sensitive than usual in people with IBS. The normal movement of food and gas through the colon causes pain, intestinal spasms and an irregular pattern of bowel movements.

With stage 2 lung cancer, the cancer can be just in one lung, locally invasive and/or spread to local lymph nodes. But it hasn’t spread to the other lung or to distant organs. Often, there are no symptoms even with stage 2 lung cancer. Symptoms might include cough, chest pain, and/or fatigue.

Diagnosing lymphedema is based primarily on history and physical exam. Swelling in one or both legs or an arm can be caused by impaired lymph circulation in the extremity or fluid accumulation from leaky blood vessels or heart problem. The clinician will press on the affected skin to look for a fingertip indentation (pitting). The skin will be indented in people with the much more common type of edema caused by leaky blood vessels. Pitting may be present with early lymphedema, but most skin does not indent with pressure.

Hypothyroidism refers to an underactive thyroid gland that is producing and secreting less than normal amounts of thyroid hormone. Hyperthyroidism means that there is abnormally high amounts of thyroid in the blood stream. Hyperthyroidism can happen when the thyroid gland either makes or secretes excess thyroid hormone or when people take a higher dose of thyroid pills than they need.

The amount of scar formation from a skin infection like impetigo or following any skin injury varies from person to person. Some people form larger and darker scars, especially after skin problems that take longer to heal. Skin color can also make a difference in the appearance of a scar.

The prognosis and life expectancy for someone with interstitial lung disease is highly variable. Some people have minimal changes seen on a chest CT scan that hardly change over time. Others can experience very rapid progression that is not slowed by treatment leading to a very poor prognosis.

Ulcerative colitis and Crohn’s disease are the two main types of inflammatory bowel disease, caused by a malfunctioning immune system. In these diseases, the immune system misfires, causing the lining of the digestive tract to become chronically inflamed and irritated. In irritable bowel syndrome (IBS) there is no obvious inflammation within the digestive tract. The underlying cause of IBS is unknown, but symptoms may arise due to uncoordinated intestinal contractions that affect bowel movements and hypersensitive nerves in the gut.