<unk> es, a common symptom of menopause and perimenopause, are typically experienced as a feeling of intense heat with sweating and rapid heartbeat, and may typically last from two to thirty minutes for each occurrence, ending just as rapidly as they began. The sensation of heat usually begins in the face or chest, although it may appear elsewhere such as the back of the neck, and it can spread throughout the whole body. Some women feel as if they are going to faint. In addition to being an internal sensation, the surface of the skin, especially on the face, becomes<unk>  to the touch. This is the origin of the alternative term "hot<unk> ", since the sensation of heat is often accompanied by visible reddening of the face. The<unk>  event may be repeated a few times each week or every few minutes throughout the day.<unk> es may begin to appear several years before menopause starts and last for years afterwards. Some women undergoing menopause never have<unk> es. Others have mild or infrequent<unk> es. The worst sufferers experience dozens of<unk> es each day. In addition,<unk> es are often more frequent and more intense during<unk>  weather or in an overheated room, the surrounding heat apparently making the<unk> es themselves both more likely to occur, and more severe. Severe<unk> es can make it difficult to get a full night's sleep (often characterized as insomnia), which in turn can affect mood, impair concentration, and cause other physical problems. When<unk> es occur at night, they are called "night sweats". As estrogen is typically lowest at night, some women get night sweats without having any<unk> es during the daytime. Young females If<unk> es occur at other times in a young female's menstrual cycle, then it might be a symptom of a problem with her pituitary gland; seeing a doctor is highly recommended. In younger females who are surgically menopausal,<unk> es are generally more intense than in older females, and they may last until natural age at menopause. Males<unk> es in males could have various causes. It can be a sign of low testosterone. Males with prostate cancer or testicular cancer can also have<unk> es, especially those who are undergoing hormone therapy with antiandrogens, also known as androgen antagonists, which reduce testosterone to castrate levels. Males who are castrated can also get<unk> es. Types Some menopausal females may experience both standard<unk> es and a second type sometimes referred to as "slow<unk> es" or "ember<unk> es". The standard<unk>  comes on rapidly, sometimes reaching maximum intensity in as little as a minute. It lasts at full intensity for only a few minutes before gradually fading. Slow "ember"<unk> es appear almost as quickly but are less intense and last for around half an hour. Females who experience them may undergo them year round, rather than primarily in the summer, and ember<unk> es may linger for years after the more intense<unk> es have passed.
Hot flash
Moonrise 
Foldscope
Sharsheret 
Lightning Strike
Drop attack
Dawn phenomenon
Blindsight