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 woman clutches her lower left back as if in some pain in that area. Photo Credit Wavebreakmedia/iStock/Getty Images. Experiencing pain in both your abdomen and back can be overwhelming and frightening. Pain in the left lower abdomen and back can signal a problem with any of a number of organs in the abdomen. woman clutches her lower left back as if in some pain in that area. Photo Credit Wavebreakmedia/iStock/Getty Images. Experiencing pain in both your abdomen and back can be overwhelming and frightening. Pain in the left lower abdomen and back can signal a problem with any of a number of organs in the abdomen.