Puffy eyes happen when fluid collects in the thin tissue around your eyes, and the fix depends on why it’s happening. For most people, the cause is temporary fluid retention from sleep, salt, or allergies, and simple steps like a cool compress, sleeping with your head raised, and limiting evening salt can visibly reduce swelling … Read more

When the air outside looks hazy or a weather app flashes an orange or red warning, the Air Quality Index is what’s behind it. The AQI is a color-coded scale from 0 to 500 that tells you how polluted the air is and what that pollution could mean for your health. Higher numbers mean more … Read more

A douche is a device used to flush fluid into the vagina or rectum. Vaginal douching is the more common form, and it has a long history in the United States — but major health bodies, including the American College of Obstetricians and Gynecologists, advise against routine vaginal douching. The vagina cleans itself, and introducing … Read more

Neem oil can kill mealybugs, but it works by contact and mainly against younger nymphs — not by soaking into the plant to kill pests systemically. The practical method is to mix a neem oil concentrate with water and a small amount of mild soap, then spray every exposed surface of the plant until wet, … Read more

You wake up, look in the mirror, and your face looks different from the one you went to sleep with. The eyelids are heavier. The cheeks are fuller. The jawline has softened. Morning facial puffiness is fluid that collected in the tissues of your face overnight while you were lying flat. Gravity is no longer … Read more

Lime green diarrhea usually means one of two things: food moved through your gut faster than normal, or you ate or drank something green. Bile, the digestive fluid your liver makes, is yellow-green. When stool moves quickly through the intestines, bile does not have time to break down into its usual brown color. That fast … Read more

Every thought, movement, and heartbeat depends on a signal that travels along a nerve fiber in milliseconds. An action potential is propagated along an axon by a repeating cycle of ion flow and voltage change: the signal triggers sodium channels to open at one patch of membrane, which flips that patch positive, which in turn … Read more

“What is the 4th hole on a woman’s body?” is a question people ask after hearing the phrase in a joke, a social media post, or a conversation. The phrase has no medical meaning. Human anatomy does not define a numbered set of “holes” in the female body, and no anatomy textbook, medical guideline, or … Read more

You cannot tell your testosterone level from how you feel, how much muscle you carry, or how your beard grows. The only reliable way to know is a blood test, usually a morning total testosterone measurement, sometimes with free testosterone and other hormones added. Symptoms and body signs can raise or lower suspicion, but they … Read more