Summarize this article in one sentence.
While you likely don't need to worry, suddenly losing your hair or having patches may be a sign of an underlying health condition that needs treatment. In some cases, your condition may even be serious. To make sure you're okay, visit your doctor to make sure you don't need medical treatment. Tell your doctor about all of the symptoms you're having, even if they don't seem related to your hair loss. This can help the doctor make a better diagnosis. Your doctor may recommend you get some diagnostic tests. While supplements are generally considered safe, they aren't right for everyone. They may worsen certain health conditions or could interact with medications you're taking. Talk to your doctor before you take a supplement to make sure it's safe for you.Tell your doctor about the supplements you plan to take and that you're hoping to regrow your hair. Additionally, remind them of the medications and supplements you're already taking.

Summary:
See your doctor if your hair loss is sudden or patchy. Check with your doctor before taking supplements.