Extreme cold is a term used to describe abnormally low temperatures that can be harmful or dangerous to human health. According to the National Weather Service, "extreme cold" is defined as temperatures that fall below 0 degrees Fahrenheit (-18 degrees Celsius) or wind chill readings that are lower than -20 degrees Fahrenheit (-29 degrees Celsius).

Prolonged exposure to extreme cold can lead to hypothermia, which occurs when the body loses heat faster than it can produce it, causing a dangerously low body temperature. Symptoms of hypothermia include shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech, and eventually unconsciousness.

Extreme cold can also cause frostbite, which is the freezing of the skin and underlying tissues. Frostbite typically affects the extremities, such as the fingers, toes, ears, and nose, and can cause numbness, tingling, aching, and blistering of the skin. In severe cases, frostbite can lead to tissue damage and loss of limbs.

To protect against extreme cold, it is important to dress in layers, wear warm clothing, cover exposed skin, stay dry, and avoid prolonged exposure to cold temperatures. It is also recommended to stay indoors during extreme cold weather events and to have a emergency plan in place in case of power outages or other emergencies.

"Cold temperature" is a relative term and its definition can vary depending on the context. In general, it refers to temperatures that are lower than those normally experienced or preferred by humans and other warm-blooded animals. In a medical context, cold temperature is often defined as an environmental temperature that is below 16°C (60.8°F).

Exposure to cold temperatures can have various physiological effects on the human body, such as vasoconstriction of blood vessels near the skin surface, increased heart rate and metabolic rate, and shivering, which helps to generate heat and maintain body temperature. Prolonged exposure to extreme cold temperatures can lead to hypothermia, a potentially life-threatening condition characterized by a drop in core body temperature below 35°C (95°F).

It's worth noting that some people may have different sensitivities to cold temperatures due to factors such as age, health status, and certain medical conditions. For example, older adults, young children, and individuals with circulatory or neurological disorders may be more susceptible to the effects of cold temperatures.

Facial neuralgia is a general term that refers to painful conditions affecting the facial nerves. It is often used to describe two specific disorders: trigeminal neuralgia and glossopharyngeal neuralgia.

1. Trigeminal neuralgia (TN), also known as tic douloureux, is a chronic pain condition that affects the trigeminal nerve, one of the major nerves of the face. The trigeminal nerve is responsible for sensations in the face and motor functions such as biting and chewing. Trigeminal neuralgia causes intense, stabbing, electric shock-like pain in the areas of the face where the branches of the nerve are distributed: the lower jaw, upper jaw, and cheek. The pain usually affects one side of the face, is triggered by light touch or other stimuli, and can last from a few seconds to several minutes.

2. Glossopharyngeal neuralgia (GPN) is a similar but less common condition that involves the glossopharyngeal nerve, which is responsible for sensations in the throat, tongue, and ear on one side of the face. GPN causes sharp, stabbing pain in these areas, often triggered by swallowing, talking, or coughing.

Both trigeminal neuralgia and glossopharyngeal neuralgia can be debilitating and significantly impact a person's quality of life. The exact cause of these conditions is not always clear, but they are often associated with nerve compression by blood vessels or tumors, age-related changes in the nerves and blood vessels, multiple sclerosis, or other underlying medical conditions. Treatment options may include medications to manage pain, surgical procedures to decompress the affected nerves, or, in some cases, radiofrequency ablation or gamma knife radiosurgery to destroy a portion of the nerve and reduce pain signals.

The Antarctic regions typically refer to the geographical areas surrounding the continent of Antarctica, including the Southern Ocean and various subantarctic islands. These regions are known for their extreme cold, ice-covered landscapes, and unique wildlife adapted to survive in harsh conditions. The Antarctic region is also home to important scientific research stations focused on topics such as climate change, marine life, and space exploration. It's worth noting that the Antarctic Treaty System governs these regions, which prohibits military activity, mineral mining, nuclear testing, and nuclear waste disposal, and promotes scientific research and cooperation among nations.

The common cold is a viral infectious disease of the upper respiratory tract. It primarily affects the nose, throat, sinuses, and upper airways. The main symptoms include sore throat, runny or stuffy nose, sneezing, cough, and fatigue. The common cold is often caused by rhinoviruses and can also be caused by other viruses like coronaviruses, coxsackieviruses, and adenoviruses. It is usually spread through respiratory droplets when an infected person coughs, sneezes, or talks. The common cold is self-limiting and typically resolves within 7-10 days, although some symptoms may last up to three weeks. There is no specific treatment for the common cold, and management focuses on relieving symptoms with over-the-counter medications, rest, and hydration. Preventive measures include frequent hand washing, avoiding close contact with sick individuals, and not touching the face with unwashed hands.