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.
Causes of sinusitis. This is caused by an infection â viral, bacterial or fungal which causes the sinuses to become swollen and blocked by infected mucous membranes. One example of a viral infection is the common cold which often causes sinusitis. The most common cause of sinusitis is a viral infection.