Alopecia Areata In this type of hair loss, hair usually falls out, resulting in totally smooth and round patches which may lead to complete loss of scalp and body hair. Even though the cause is unknown, there seems to be an immune element involved, as evidenced by the response to local steroid treatment in some patients. Postpartum After delivery, many hair enter the resting phase of the cycle so that within 2 to 3 months, some women will notice large amounts of hair falling out. This can last 1 to 6 months but resolves completely in most cases. Get Free Consultation from Hair Transplantation Surgeon High Fever, Severe Infection, Major Surgery/Chronic Illness One to 3 months after any of these conditions there will be severe hair falling out. Thyroid Disease Both hyperthyroidism and a hypothyroidism can cause hair loss. While this type of hair loss can rarely be reversed, there are medical options to have a thick head of hair for people with Th...