Genetics: Your family history is the biggest predictor of thinning hair, especially typical male pattern baldness. That means if other men in your family have had hair loss, you are more likely to as well.
Hormones: Blame it on testosterone, at least in part, because cells in the scalps of men who are genetically disposed convert that essential male hormone into another hormone known as DHT that causes follicles to shrink and eventually stop growing hair. The hormonal changes that occur during menopause are a common cause of thinning hair in women; in men, thyroid issues can also contribute to hair loss.
Medical Conditions: Male pattern baldness has also been associated with medical conditions like heart disease, high blood pressure, enlarged prostates, diabetes and obesity.
Medications: A variety of drugs are linked to hair loss including those used to treat arthritis, depression, high blood pressure, heart problems and, of course, cancer (hair that is lost during cancer treatments typically returns). Always talk to your doctor if you have any questions about medication regiments.
Stressful Events: A big shock to the system, whether caused by emotional or physical stress, can trigger hair thinning. Examples of such so-called trigger events include surgery or a death in the family.
Scalp Disorders: Conditions that cause hair loss in men include ringworm, a fungal infection, and folliculitis, the inflammation of hair follicles often caused by a bacterial infection. Psoriasis and seborrheic dermatitis on the scalp may also lead to hair thinning .
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