algesi-, alge-, alges-, algesio-, algi-, algio-, -algesia, -algesic, -algetic, -algic, -algia, -algy

(Greek: pain, sense of pain; painful; hurting)

Used actively in medical terminology to denote a condition of sensitivity to pain as specified by the combining root.

Pain in the heel or ankle.
Pain in the tarsus or in the instep of the foot, or the ankle and the foot.
Referred pain or pain from deep structures perceived as arising from a surface area away from its actual origin or pain felt in a part of the body other than that place in which the cause that produced it is situated.
Pain referred to or located in a tendon.
thermalgesia, thermoalgesia
1. High sensibility to heat; pain caused by a slight degree of heat.
2. A condition in which the application of heat produces pain.
thermalgia, thermoalgia, causalgia
1. A condition marked by sensations of intense burning pain.
2. A sensation of intense burning pain which is sometimes experienced following nerve injuries.
3. Persistent severe burning of the skin; usually, following a direct or an indirect trauma to a sensory nerve, accompanied by cutaneus (skin) changes.
Loss of temperature sense or of the ability to distinguish between heat and cold; insensibility to heat or to temperature changes.

A standard test of pain response involves applying heat to the skin, and most of us perceive pain when the skin reaches an average critical temperature of 113 degrees F (45 degrees C), and everyone, with the exception of people with serious sensory dysfunction, perceives pain before his or her skin reaches a temperature of 116.6 degrees F (47 degrees C).

Even though there are three to four times fewer heat receptors than cold receptors in the human skin, freezing cold and burning hot sensation are both experienced exactly the same. Indeed, at 140 degrees F (60 degrees C) both the cold and heat pain nerve endings are stimulated, and after a point, there is no reason to make fine distinctions—all the brain has to know is that it is very painful!

—Neil McAleer in The Body Almanac;
Doubleday & Company, Inc., Garden City, New York, 1985; page 60.
Pain caused by a slight degree of heat.

As a fever indicates that the body is fighting infection, pain has its purpose in reporting injury or internal problems. Unfortunately, pain is not a reliable indicator, and it is of limited help to a physician in forming an accurate diagnosis.

The perception of a pain’s very source may be incorrect. The tooth that one points out as the one that hurts may not be the one that’s abscessed.

That pain in a person’s arm may not be caused by a strain or injury to that area, but it could be the result of a problem in his/her heart or other organ.

These are examples of a phenomenon known as "referred pain".

—Neil McAleer in The Body Almanac;
Doubleday & Company, Inc., Garden City, New York, 1985; page 92.
1. Insensibility to heat or to temperature changes.
2. Absence of pain when heat is applied.
1. Diminished pain to heat stimuli including high temperatures.
2. A decreased feeling of pain when exposed to heat.
1. Excessive thermalgesia (pain caused by a slight degree of heat).
2. A condition in which the application of moderate heat causes extreme pain.
3. Pain induced by hot or cold stimuli at thresholds lower than normal.
Pain in the chest.
throe, throes
1. A violent spasm or pang; paroxysm.
2. A sharp attack of emotion.
3. Any violent convulsion or struggle; such as, a condition of agonizing struggle or trouble: a country in the throes of economic collapse. The agony of death, or the pains of childbirth.
4. Etymology: from Middle English throwe, perhaps an alteration of thrawe, from Old English thrawu, genitive of thrah, "pain, affliction".

Although this word, throe, is NOT related directly to this algesi- family, it is applicable in meaning.

Pain in the shin.
1. Pain localized in one spot; a symptom occurring in neuroses whereby localized pain, without evident organic basis, is experienced.
2. Localized pain occurring in neurotic subjects.

You may take self-scoring quizzes over some of the words in this unit by going to Algesi Quiz to check your word knowledge of these words.