Helminth infections -- worm infections -- are a major cause of illness worldwide. Even though public sanitation has led to a decreasing rate of helminth infections in the United States, worms can still cause infection when you travel, eat undercooked meats, or fall victim to poor sanitation.

Like many exercise related injuries, Achilles tendinitis, or pain in the Achilles tendon at the back of the ankle, typically results from overuse and repetitive stress.

Depressants are so called because they depress, or slow down, central nervous system functioning. This causes physical depression, lowered inhibitions, sedation, sleep, anesthesia, unconsciousness and potentially coma and death.

Dextromethorphan is a medication that is used to relieve coughing problems because of colds or influenza (see link in References). Dextromethorphan is not indicated for the treatment of coughs caused by asthma, smoking or emphysema.

Even the most laid-back people sometimes experience anxiety. While occasional anxiety is a normal experience, frequent anxiety may signal a mental or physical disorder. Anxiety originates in your brain but triggers many physical responses.

According to the American Geriatrics Society, breathing problems such as shortness of breath, discomfort in chest, coughing and wheezing, often have causes in underlying illnesses. These respiratory illnesses include chronic bronchitis, asthma and pulmonary emphysema as reported by National Jewish Health.

The influenza virus primarily infects the respiratory tract, causing sore throat, coughing, fever and muscle aches. But influenza can also cause digestive symptoms. A December 2015 "Virology Journal"

Squats are an exercise that involves lifting weights upon your shoulders and conducting a series of squatting movements. This strengthens your legs, especially the group of four muscles above your knee called the quadriceps.

Animal bites are a common occurrence, particularly among children. According to the American Society for Surgery of the Hand, dogs cause the majority of animal bites in the United States. Other animals that bite humans include cat, rodents and farm animals.

It seems to make perfect sense that too much vitamin K may not be the best thing for your blood pressure control. Your suspicions may further be validated by the wide use of anti-coagulant prescriptions to prevent strokes, heart attacks or embolisms.

The vomiting, diarrhea, muscle aches and low-grade fever that generally accompany the stomach flu can leave a child in misery for days. Symptoms of the stomach flu, or viral gastroenteritis, can last for up to 10 days, although some children luck out and feel better after one or two days.

If you're on a low-carb diet or you're diabetic, you may sometimes notice a funny taste in your mouth when your blood sugar, also known as blood glucose, is low. It isn't bad breath from poor oral hygiene -- it's a result of your body not being able to burn carbohydrates for energy and burning fat instead.