Can not determine if this is Sinusitis or Abscessed Tooth, symptoms from both present and some rule out each diagnosis I have had a low grade fever, left side facial swelling and what looks to be a collection of pus build up along the upper left side of my gums for the past three days. I have done some research but I have conflicting symptoms between Sinusitis and a tooth abscess . For Sinusitis: Fever Facial Swelling and slight tenderness on left side Yellowish mucus Pressure on sinuses when I lean forward Pressure on sinuses when I blow my nose For Abscess: Pus build up above tooth (again it is on the top left, one back from the eye tooth) Fever Facial Swelling and slight tenderness Symptoms that cause confliction: No pain in tooth when biting down, or to cold/heat Low Grade fever, has not gone over 99.6 No strong pain, I would rate my pain as at worst a 2, usually between 0.4 and 1 though even when eating or drinking hot/cold liquids. Tooth in question was cracked over a year ago Tooth does not feel loose and surrounding teeth to not have any pain at all At least two times this past weekend the collection of pus has drained from around the tooth. After the second time there has been a decrease in the amount of puss being collected, still have facial swelling. The first 2 nights, Friday night and Saturday night, was not able to sleep for more then two hours at a time, last night got my first full night of sleep w/o interruptions. No facial swelling on the right side of my face I did have a problem breathing through the left nostril for the first day but then swelling receded a bit on second day; no problems breathing through nose last night or today. Remedies Tried: I have been taking Sudafed PE (contains: acetaminophen , diphenhydramine HCI and phenylephrine HCI, pain reliever, antihistamine, nasal decongestant) for the past two days to reduce the swelling and so that I could sleep throughout the night. I also have been trying steam therapy and hot compresses on the swelled section of my face. Other Symptoms: Have not felt nauseous Have had a slight loss of apatite mild Cotton Mouth