Hello dear, Causes of hair loss/thinning of hair are: 1. Environmental factors 2. Stress 3. Deficiency of certain minerals, vitamins & amino acids in diet. e.g. Iron, zinc, Vit B complex, lysine. 4. Hormonal factors. e.g. Thyroxine 5. Any incidence of surgery, shock, etc. Mintop contains Minoxidil which helps to stimulate the hair follicles. Side effects like redness or burning sensation may be present. But they are well tolerated & subside on its own. One more thing, hair loss tend to increase on sudden stoppage of Minoxidil. So, it will be better to consult a Dermatologist to find out the underlying cause & start treatment accordingly. Take care.