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Tinnitus, or ringing in the ears, often...

You might know that chickenpox and shingles are both caused by the same virus, varicella zoster. Here's why the symptoms, and even the vaccines, are different the second time around.

The cold medicine you picked up at the store involves some cool chemistry to treat your symptoms. *Correction: This episode was written by Alison Caldwell.

If we’ve had vaccines for the polio virus for almost 70 years, why haven’t we been able to fully eradicate it from the globe? Hosted by: Hank Green (he/him)

Actor and activist Fehinti Balogun pieces together multiple complex issues -- climate change, colonialism, systemic racism -- in a talk that's part spoken-word poem, part diagnosis of entrenched global problems. Seeing the connections is...

You all had some questions that you really wanted answers to over the years, so we’ve compiled a bunch of the most popular videos answering those questions together in one place!

The cold medicine you picked up at the store involves some cool chemistry to treat your symptoms.

Alzheimer's disease is the most common cause of dementia, affecting over 40 million people worldwide. And though it was discovered over a century ago, scientists are still grappling for a cure. Ivan Seah Yu Jun describes how Alzheimer's...

A lot of people with coughs or fevers might be stressing out these days because they are worried that they have COVID-19. But with cold and flu season still in full swing, and the spring allergy season starting up (in the Northern...

Many of us have longed for cool sci-fi inventions like a holodeck or replicators, but there's one tool we're actually getting pretty darn close to creating: the medical tricorder.

The list of symptoms for “Long COVID” are even more vast than the opinions about the right name for the condition. But the more we learn about it, and how it is similar to other post-infection syndromes, the better we can help those who...

Matthew O’Reilly is a veteran emergency medical technician on Long Island, New York. In this talk, O’Reilly describes what happens next when a gravely hurt patient asks him: “Am I going to die?”

Constipation is no fun. Luckily, it can usually be remedied with a handful of prunes, a few cups of coffee, and some patience. However, if you don't poop for a long, long time, constipation can develop into some serious health problems.

If you’re someone who is constantly coughing up mucus, you might not actually have allergies. There’s a possibility that your organs are flipped and you don’t even know it!

Can we, as adults, grow new neurons? Neuroscientist Sandrine Thuret says that we can, and she offers research and practical advice on how we can help our brains better perform neurogenesis—improving mood, increasing memory formation and...

Experts can't agree on the definition of the term "concussion," which makes it difficult to diagnose, treat, and research this important brain injury....

This week's SciShow News finds Hank up to his elbows in weird disorders and strange behaviors, including a chemical that makes men stay faithful, new insights into what makes some behavior contagious, and the truth about a disease that...

There’s no doubt that lithium has a diverse list of uses. But the way that it interacts with our bodies to help treat bipolar disorder is aiding us in better understanding the disorder and potentially developing new drugs to combat it.

Tinnitus has been bothering humanity since Ancient Babylon, plaguing everyone from Leonardo da Vinci to Charles Darwin. Today, roughly one in seven people worldwide experiences this auditory sensation. So what exactly is tinnitus, and...

We think of pain as a symptom, but there are cases where the nervous system develops feedback loops and pain becomes a terrifying disease in itself. Starting with the story of a girl whose sprained wrist turned into a nightmare, Elliot...

Howcast - Learn if breast pain is ever a symptom of breast cancer in this Howcast video with expert Marisa Weiss, MD.

Howcast - Learn the causes of delayed ejaculation from sex therapist Dr. Megan Fleming in this Howcast video about the psychology of sex.

Howcast - Learn about heartburn from gastroenterologist Lisa Ganju, M.D. in this Howcast video about stomach problems and digestive disorders.

Howcast - Maybe your beloved pet's food is contaminated or maybe your pet simply raided the kitchen trash. Whatever the case, they may have been exposed to salmonella. Learn how to recognize the symptoms of salmonella poisoning in your...