There are plenty of reasons why your back can hurt. They range from the mildest and easier to manage to the most complex and sometimes difficult to treat.
The most common causes of back pain include muscle-related pain in young patients and degenerative disc disease in older adults. Osteoporosis and microscopic fractures can also lead to lingering back pain in the adult population. Obesity is a cause of obesity in young adults, and poor posture is becoming increasingly common as a cause of back pain in children and adolescents.
Treating back pain is sometimes very easy, and the symptoms can be transient and respond to over-the-counter medications. But if your problem is not responding well or the pain keeps coming back, a formal diagnosis is probably the only way to reduce the burden of the disease.