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.
1 This is diagnosed by a swelling in the left side of the area where menses occur. 2  This is a common condition caused by the presence of womb tissues outside the womb. 3  Pyelonephritis (kidney infection). 4  Affected kidney on the left side can lead to pain in the left abdomen.