In certain cases, apple cider vinegar relieves an itchy scalp, according to Cosmopolitan. If the discomfort is caused by excessive yeast on the scalp, vinegar is an appropriate remedy. Another symptom of too much yeast is dandruff, CNN states.
Other conditions that cause itchy scalp often require other treatments. Allergic contact dermatitis is an allergic reaction to shampoo, conditioner or other hair products, CNN explains. This condition is typically treated by stopping the use of the product, WebMD reports. Topical lotions or oral antihistamines can control the itching.
If hair follicles become inflamed, or if the scalp develops a bacterial infection, extreme itchiness results, advises CNN. Bumps similar to acne often form in the affected area. Medicated shampoo usually relieves the symptoms, states WebMD.