This infection may increase post-nasal drip. If you suspect that you have a sinus infection, you should see your physician to see if it needs antibiotic treatment. Chronic sinusitis occurs when sinus blockages persist, causing the lining of the sinuses to swell further.
Causes of Pain in Left Side Back. 1  Pregnancy: Back pain especially on the left side, is very common in pregnancy and happens for a few reasons. As the child develops in size, the uterus can pack torment delicate structures including nerves. 2  Kidney Infection: Kidney diseases can cause left side back pain.
Treatment Options. Fibromyalgia. This condition causes the tissue, tendons, muscles and joints to become tender, which can lead to back or neck pain on the left side. Trauma or a disturbance in your sleep can cause these symptoms. Light massage, pain medication, muscle relaxants or antidepressants can be prescribed.