Frownies
Condition the male hormone testosterone is converted to Frownies (DHT). This process takes place, inter alia, in the hair follicles. If DHT is not degraded during the process this hormone binds itself to a so-called androgen receptor. This causes the hair follicle dies, the result that no new hairs grow more. If this happens at multiple follicles become slowly more barren.
Stress. By stress more hairs than the normal to per day in the resting phase and fall out.
Medication. Many medications have hair loss as a possible side effect. Blood thinners, cholesterol-lowering drugs and antidepressants are an example.
Iron deficiency. Hair thinning and losing luster. Because iron deficiency is too little oxygen in the haarfolikels and fall out.