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.
Left side of human body contains different types of body part including left side chest, left side abdomen, left side neck and much more. Any of the left side organs can feel pain any time due to different kinds of reasons. Most common type of pain in left side is chest pain in left side as well as abdomen pain in left side.