Common causes include androgenetic alopecia (genetic pattern hair loss), telogen effluvium (temporary shedding after stress, illness, childbirth, or weight change), alopecia areata (an autoimmune cause), thyroid or hormonal issues, and nutritional deficiencies.

Also called male- or female-pattern hair loss, it is the most common type. In women it often appears as widening of the part and overall thinning on top; in men, as a receding hairline and crown thinning.

A temporary increase in shedding that usually begins a few months after a trigger such as illness, surgery, major stress, childbirth, or rapid weight loss. It typically improves once the trigger resolves.

Depending on the cause, options include topical minoxidil, oral medications (such as finasteride or spironolactone for appropriate patients), treating any underlying condition, and addressing nutrition. Your provider will tailor the plan to your diagnosis.

Topical minoxidil is an FDA-approved treatment that can slow loss and promote regrowth for many people with pattern hair loss. It works best with consistent daily use, and results take several months.

Sometimes. Lab tests such as thyroid, iron, and hormone levels can help identify treatable causes of hair loss. Your provider will let you know if testing is recommended; lab costs are additional.

Hair grows slowly, so most treatments take 3 to 6 months before you notice a difference, and continued use is usually needed to maintain results.

Many types of hair loss can be improved or stabilized, especially when treated early. Some forms are permanent, but starting treatment sooner generally gives the best chance of preserving and regrowing hair.