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.
Allergies and the sinus pressure connection. Allergic reaction to the environment is a major cause of sinus pressure. Pollen allergy being one of the most common. Excessive sinus drainage can also accompany an allergic reaction. The home environment can be the cause of allergies. For example, animal dander, house dust, dust mites droppings, cleaning and washing chemicals.