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.
Any time you experience pain, especially on the left side of your lower back, you should contact your doctor. Treatment will depend on the reason. You should never ignore your pain because it could cause serious effects. However, if you take care of it right away, it could be as simple as taking an antibiotic.