Hairloss cause by the microtauma at the scalp due to pressure in the medium cause by heavy hat how to i remove the pressure and stop the hair loss?

Must you wear it?: If this is a safety helmet, and the hair loss corresponds closely to where the hat rubs your head, and you can't go without it, then keep wearing it. People admire those who do "hard hat" jobs and the hair loss is a plus. Otherwise, get a second opinion. There may actually be some other cause, such as telogen effluvium or alopecia areata, worth identifying now.