Original sentence: Common symptoms include an excesive 'hunch' (kyphosis) and mild back pain.In more serious cases, patients may need to temporarily wear a back brace to correct posture.In the most extreme cases, back surgery may be required.It has been suggested that up to 20% of the population can be classified as having the condition.Most cases of the condition are mild, and in many cases, never even found.Scheuermann's disease is really a medical condition rathan than a disease.Typically sufferers of Scheuermann's disease can help the pain by working out and increasing muscle mass