If you start to experience sudden hair loss, large bald patches at the top of your head, major recession in your hairline or part, or pain or itchiness in the scalp, all experts recommend seeking medical attention with your health care provider. And as with anything, the best form of treatment is to catch it early to prevent further hair loss from happening. “If people want to intervene [with hair loss], early intervention is key,” says Dr. Khetarpal.