Heart valve disease may develop either before birth (congenitally) or throughout an individual's lifetime. Sometimes, it might even happen for unknown causes. Congenital valve disease tends to affect the pulmonic or aortic valve. The valve could be the wrong size, have leaflets which don't att...
It works quickly and may affect sexual interest, but it also causes nausea and, sometimes, syncope (fainting). It acts on the central nervous system. There is also a nasal spray version in development. (Interestingly, it used to be used in aversion therapy to try to "convert" gay men ...
Vertebrobasilar insufficiency is twice as likely to happen to a man than a woman. As you get older, you're also more likely to experience the disease. Your risk increases at younger ages if you have plaque buildup, also called atherosclerotic disease, in your arteries. These risk factors m...
It seems that we no longer need toremember most things. Does it matter?Researchers have recognized several problems thatmay happen. For one, human beings have biases(偏见)and smat machines are likely to increase our biases. Manypeople believe smart machines are necessarily correct andobjective, bu...
How much caffeine does it take to become dangerous and possibly lead to caffeine overdose? While it depends a lot on the person, a dose as little as 500 milligrams of caffeine and up could potentially produce some symptoms of caffeine overdose. Some people feel fine, or their perceived “nor...
When your heart beats much faster than its normal rate, it's called tachycardia. This tends to happen in decompensated heart failure.Tachycardiacan lead to several complications, including andfainting. The extra heartbeats can also weaken the heart muscle further. ...
Abruption in prior pregnancies (you have a 10% risk it will happen again) Uterine rupture This is an abnormal splitting open of the uterus, causing the baby to be partially or completely expelled into the abdomen. Uterine rupture is rare, but very dangerous for both mother and baby. About ...
Your toddler’s tantrums can range in frequency and severity. After a while, you may notice a pattern. For example, a tantrum may happen when your child doesn’t get a favorite toy or when they’re tired from an eventful day. Or, the tantrums may happen at the same time every day, ...
That sounds simple enough, but in many cases, step two doesn't happen, making step three difficult or impossible. Although the man is stimulated, the penis doesn't become erect. To understand why, you need to understand the technology of an erection. ...
How does this happen? This “stress hormone” accelerates the breakdown of collagen and elastin, the very proteins that give your skin its youthful bounce and resilience. The result? An increase in the appearance of fine lines and wrinkles that makes you look older than your years. ...