Symptoms and signs of hair loss may be the next: Many women and men have gradual thinning on top of head. This problem is the most popular. Men have hair loss,when their hair recede from the forehead in a line (this line looks like the letter M) . But the women quite the contrary retain a line of hair. Patchy or circular bald spots. There are many men and woman who have smooth bald spots. A emotional or physical shock can cause to sudden loosening of hair. You may lose your hair when you wash or comb your hair. This problem causes overall hair thinning. Also if you have some medical treatments or conditions , (for example chemotherapy for cancer), you may have the full-body hair loss .