1. Physical Stress

One of the most common forms of hair loss is telogen effluvium, which occurs due to any kind of physical trauma. After a stressful event like surgeries, accidents, severe illness or even flu, your hair cycle messes up, pushing more hair into the shedding phase.
2. Vitamin A

Be careful with consuming huge quantities of products and supplements containing Vitamin A, because it can easily trigger hair loss. Actually, the daily value for Vitamin A should be 5,000 International Units for adults.