The common cold is generally mild and self-limiting with most symptoms generally improving in a week. Half of cases go away in 10 days and 90% in 15 days. Severe complications, if they occur, are usually in the very old, the very young, or those who are immunosuppressed.
Types of sick sinus syndrome and their causes include: 1  Sinoatrial block. Electrical signals move too slowly through the sinus node, causing an abnormally slow heart rate. 2  Sinus arrest. The sinus node activity pauses.  Bradycardia-tachycardia syndrome.
Anything that causes increase in your sinuses can cause sinusitis. This can occur because of difference in air pressure. Allergies such as hay fever can cause sinusitis. Using decongestant nasal sprays too much swimming or diving can also cause or increase your risk of getting sinusitis.