ABSTRACT
Each day, an average of 30-80 hairs in the final telogen phase are lost. At the same time, 30-80 new hair cycles begin, so that the number of hair on the scalp remains constant (100,000-160,000 on the whole scalp of an adult). In the northern hemisphere, seasonal variations have been described with a peak in hair loss during the Spring and the months of August and September (1,2). This seasonal variation must be taken into consideration when interpreting trichograms and the hair loss intensity during these calendar periods. These variations also explain the increased number of consultations for hair loss during late summer.
