PHP 5 Constants. Constants are like variables except that once they are defined they cannot be changed or undefined. PHP Constants. A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across the entire script. Create a PHP Constant.
Pressure sores that do not heal may also cause sinus tracts to form. Sinus tracts are passages that connect the infected area of the skin surface or the sore to other structures, such as those deep in the body. For example, a sinus tract from a pressure sore near the pelvis can connect to the bowel.
CAUSES OF SINUS PRESSURE AND PAIN. As described on the Congestion page, swollen nasal passages and the build-up of mucus cause congestion. Swollen and inflamed tissues can also cause pressure on nerve endings around your sinuses. This leads to dull or throbbing pain and aches. causes forehead pain, headaches.