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.
A sharp pain on the left side of the neck may indicate bone or joint abnormalities, poor posture, muscle strain, tumors or degenerative diseases, explains WebMD. An injury to the rotator cuff in the shoulder may also be the cause of the neck pain, according to Cleveland Clinic. Keep Learning.