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.
Inflammation of the lung membrane (pleuritis) on the left side can cause stabbing pain around the lower ribs. Pain is usually affected by deep breath and cough. Pneumonia(bacterial, viral or caused by mycoplasma or other microbes) affecting the left lung can cause cough, left side chest pain and fever.