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What is Postorgasmic illness syndrome and explain in detail?
Postorgasmic illness syndrome (POIS) is a syndrome in which people have chronic physical and cognitive symptoms following ejaculation. The symptoms usually onset within seconds, minutes, or hours, and last for up to a week. The cause and prevalence are unknown; it is considered a rare disease.

Signs and symptoms
The distinguishing characteristics of POIS are:

the rapid onset of symptoms after ejaculation;
the presence of an overwhelming systemic reaction.POIS symptoms, which are called a "POIS attack", can include some combination of the following: cognitive dysfunction, aphasia, severe muscle pain throughout the body, severe fatigue, weakness, and flu-like or allergy-like symptoms, such as sneezing, itchy eyes, and nasal irritation. Additional symptoms include headache, dizziness, lightheadedness, extreme hunger, sensory and motor problems, intense discomfort, irritability, anxiety, gastrointestinal disturbances, craving for relief, susceptibility to nervous system stresses (e.g. common cold), depressed mood, and difficulty communicating, remembering words, reading and retaining information, concentrating, and socializing. Affected individuals may also experience intense warmth or cold. An online anonymous self-report study found that 80% of respondents always experienced the symptom cluster involving fatigue, insomnia, irritation, and concentration difficulties.The symptoms usually begin within 30 minutes of ejaculation, and can last for several days, sometimes up to a week. In some cases, symptoms may be delayed by 2 to 3 days or may last up to 2 weeks.In some men, the onset of POIS is in puberty, while in others, the onset is later in life. POIS that is manifest from the first ejaculations in adolescence is called primary type; POIS that starts later in life is called secondary type.Many individuals with POIS report lifelong premature ejaculation, with intravaginal ejaculation latency time (IELT) of less than one minute.
The 7 clusters of symptoms of criterion 1:

Synonyms and related conditions
POIS has been called by a number of other names, including "postejaculatory syndrome", "postorgasm illness syndrome", "post ejaculation sickness", and "post orgasmic sick syndrome".Dhat syndrome is a condition, first described in 1960 in India, with symptoms similar to POIS. Dhat syndrome is thought to be a culture-bound psychiatric condition and is treated with cognitive behavioral therapy along with anti-anxiety and antidepressant drugs.Post-coital tristesse (PCT) is a feeling of melancholy and anxiety after sexual intercourse that lasts anywhere from five minutes to two hours. PCT, which affects both men and women, occurs only after sexual intercourse and does not require an orgasm to occur, and in that its effects are primarily emotional rather than physiological. By contrast, POIS affects only men, consists primarily of physiological symptoms that are triggered by ejaculation and that can last, in some people, for up to a week. While PCT and POIS are distinct conditions, some doctors speculate that they could be related.An array of more subtle and lingering symptoms after orgasm, which do not constitute POIS, may contribute to habituation between mates. They may show up as restlessness, irritability, increased sexual frustration, apathy, sluggishness, neediness, dissatisfaction with a mate, or weepiness over the days or weeks after intense sexual stimulation. Such phenomena may be part of human mating physiology itself.
Sexual headache is a distinct condition characterized by headaches that usually begin before or during orgasm.

Mechanism
The cause of POIS is unknown. Some doctors hypothesize that POIS is caused by an auto-immune reaction. Other doctors suspect a hormone imbalance as the cause. Different causes have also been proposed. None of the proposed causes fully explain the disease.

Allergy hypothesis
According to one hypothesis, "POIS is caused by Type-I and Type-IV allergy to the males own semen". This was conditioned by another study stating "IgE-mediated semen allergy in men may not be the potential mechanism of POIS".Alternatively, POIS could be caused by an auto-immune reaction not to semen, but to a different substance released during ejaculation, such as cytokines.

Hormone hypothesis
According to another hypothesis, POIS is caused by a hormone imbalance, such as low progesterone, low cortisol, low testosterone, elevated prolactin, hypothyroidism, or low DHEA.POIS could be caused by a defect in neurosteroid precursor synthesis. If so, the same treatment may not be effective for all individuals. Different individuals could have different missing precursors leading to a deficiency of the same neurosteroid, causing similar symptoms.

Withdrawal hypothesis
The majority of POIS symptoms like fatigue, muscle pains, sweating, mood disturbances, irritability, and poor concentration are also caused by withdrawal from different drug classes and natural reinforcers. It is  unknown whether there is a relationship between hypersexuality, pornography addiction, compulsive sexual behavior and POIS. Some evidence indicates that POIS patients have a history of excessive masturbation, suggesting that POIS could be a consequence of sex addiction. There is anecdotal evidence on porn addiction internet forums, that many men experience POIS like symptoms after ejaculation.

Other possibilities
POIS could be caused by hyperglycemia or by chemical imbalances in the brain.Sexual activity for the first time may set the stage for an associated asthma attack or may aggravate pre-existing asthma. Intense emotional stimuli during sexual intercourse can lead to autonomic imbalance with parasympathetic over-reactivity, releasing mast cell mediators that can provoke postcoital asthma and / or rhinitis in these patients.It is also possible that the causes of POIS are different in different individuals. POIS could represent "a spectrum of syndromes of differing" causes.None of the proposed causes for POIS fully explain the connection between POIS and lifelong premature ejaculation.

Diagnosis
There is no generally agreed upon diagnostic criteria for POIS. One group has developed five preliminary criteria for diagnosing POIS. These are:

POIS is prone to being erroneously ascribed to psychological factors such as hypochondriasis or somatic symptom disorder.An online survey study suggested that only a small number of self-reported POIS fulfill entirely the five criteria. This study proposed to change the Criterion 3 with “In at least one ejaculatory setting (sex, masturbation, or nocturnal emission), symptoms occur after all or almost all ejaculations.”

Management
There is no standard method of treating or managing POIS. Patients need to be thoroughly examined in an attempt to find the causes of their POIS symptoms, which are often difficult to determine, and which vary across patients. Once a cause is hypothesized, an appropriate treatment can be attempted. At times, more than one treatment is attempted, until one that works is found.Affected individuals typically avoid sexual activity, especially ejaculation, or schedule it for times when they can rest and recover for several days afterwards. In case post-coital tristesse (PCT) is suspected, patients could be treated with selective serotonin reuptake inhibitors.In one patient, the POIS symptoms were so severe, that he decided to undergo removal of the testicles, prostate, and seminal vesicles in order to relieve them. The POIS symptoms were cured by this.Another patient, in whom POIS was suspected to be caused by cytokine release, was successfully treated with nonsteroidal anti-inflammatory drugs (NSAIDs) just prior to and for a day or two after ejaculation