Hiccup
Sneeze
Thumps, a more serious form of hiccups found in equines
Yawn
Vocal hiccup

References
Further reading
External links

BBC News: Why we hiccup
WIRED: The Best Cure for Hiccups: Remind Your Brain Youre Not a Fish
Cymet TC (June 2002). "Retrospective analysis of hiccups in patients at a community hospital from 1995–2000". J Natl Med Assoc. 94 (6): 480–3. PMC 2594386. PMID 12078929. WebMD: Hiccups
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.