Phlegm: Causes and Remedies.
Phlegm, also known as sputum, is a slimy substance found in the throat and lungs that helps trap harmful particles and lubricate tissues. Excess phlegm can be caused by infections, allergies, or chronic respiratory illnesses. The color of phlegm can indicate health issues, with clear phlegm being normal and yellow or green indicating a bacterial infection. Home remedies to reduce phlegm include drinking fluids, using a humidifier, gargling with salt water, and using expectorant medication. Seek medical care if phlegm persists for more than three or four weeks, or if accompanied by chest pain, wheezing, or difficulty breathing.