By Setareh Kiumarsi
You’ve probably heard about “phlegm”—that infamous character who seems to pop up in every health-focused Telegram channel or traditional medicine page on Instagram. But what is phlegm, really?
Phlegm is a moist substance; one that softens its surroundings and counters dryness. But there are actually two kinds of phlegm: good phlegm and bad phlegm. So what’s the difference?
Good phlegm, or healthy bodily moisture
Think about the mucus that lines your digestive tract—it helps food move through your gut smoothly.
Think about your saliva; it keeps your tongue from sticking to your mouth, allows you to taste properly, and transforms each bite from a solid mass into a fluid full of digestive enzymes.
Now consider your stomach lining, your tears, the moisture on your skin, the mucus in your nose, the smooth function of your joints…
All of this healthy internal moisture is a form of beneficial phlegm.
So where does this good moisture come from?
If your digestive fire is strong and your diet is well-balanced, one of the natural outcomes of proper digestion is the creation of digested phlegm; moisture that’s well-integrated into the body. This beneficial moisture nourishes your organs and lubricates your cells. It keeps various systems of the body from drying out, so they can function optimally.
But what about bad phlegm?
Bad or undigested phlegm
When your digestive fire is weak, or when you consistently eat improper food combinations—like animal protein with dairy, or banana with milk—and layer food on top of food without giving your body a break, your gut simply can’t keep up. It fails to digest everything properly, and the result is toxins and undigested phlegm building up in the digestive tract.
This undigested phlegm doesn’t stay put. Over time, it spills out of the gut and into other channels of the body. At first, the body tries to get rid of it however it can; through urine, stool, sweat, menstruation, and other detox pathways.
But when the volume of waste and undigested moisture becomes too much to handle, the body starts to store it.
And then what happens?
That bad phlegm begins to settle into tissues and organs. It becomes layers of fat and excess weight. It fills the lungs with mucus, showing up as post-nasal drip, congestion, sinus infections, allergies, or respiratory issues. It contributes to fatty liver, raises your cholesterol, thickens the blood, and can lead to poor pancreatic function (causing diabetes) or underactive thyroid. It may settle in the reproductive system as ovarian cysts, fibroids, or enlarged prostate.
And what about the emotional effects?
Excess phlegm can also cause depression, lethargy, mental fog, and a sense of stagnation or helplessness. In Ayurvedic terms, this is what happens when the kapha dosha becomes imbalanced—too much phlegm (kapha) leads to a wide range of physical and mental disturbances.
Please be sure to credit the author, Setareh Kiumarsi, when sharing or republishing this article, which was written with love and the hope of well-being for all.
