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 sudden nasal congestion can aggravate already pre-existing obstructions and arousals. One theory about why people get sinusitis is that the sinus and nasal passageways are too small. This can happen due to upper and lower jaw underdevelopment, which is the basis for obstructive sleep apnea.