Hair loss is a physiological phenomenon that is a manifestation of metabolism. However, most people experience massive hair loss when major changes occur in their bodies. For example, excessive weight loss, pregnancy and maternity, sudden stress (such as the death of a loved one, divorce, unemployment, loss of love, etc.), high fever (especially after a high fever subsides), recovery from surgery or a major illness, stopping taking birth control pills, etc. Generally, after a period of time, hair can grow back to its original level again. Excessive hair loss can persist if you are under some kind of stress or stimulation all the time, so in addition to trying to avoid the previously mentioned triggers, you should also learn to de-stress yourself. In addition, other factors should be ruled out to cause massive hair loss, or even hair loss, such as genetic factors, excessive immune system response, certain medications and therapies, harmful hair care and beauty products, excessive hair pulling, endocrine related diseases (male hypotesticularism, female hypovarianism, hypoadrenocorticism, autoimmune polyendocrine gland syndrome, hypothyroidism, vitamin D resistant rickets, etc.), etc. We need to identify the causative factors and deal with them.