I wasn't even looking for this but this is what I came across. It's just simply explaining how they are good. I haven't tried to look for the bad.
Chile peppers are all-season foods: they warm you up in winter and cool you down in the summer. This correlates to the feeling of warmth when eating chillies. Hot foods do increase perspiration, which may be the underlying reason they are enjoyed in hot climates. So a sweat and possibly a brief increase in your metabolic rate won't influence weight loss either. The best contribution to weight loss is the flavours chillies can add to foods when the fat has been removed. Studies done in populations that use hot peppers consistently found that these people show no higher incidence of any gastrointestinal diseases. In fact, there are some areas where they exhibit some beneficial effects. The Capsaicin has been identified as an anticoagulant and could possibly aid in preventing a heart attack or stroke. Since 1982, there have been more than 2,000 scientific studies published describing the medicinal benefits of chillies. These include treatments for asthma, arthritis, blood clots, cluster headaches, shingles and severe burns.
It is believed that relief of PMS can come from the Endorphin release after eating chillies, although there is certainly the possibility of other factors coming into play. Aside from the documented physiological/psychological effects of endorphins, chillies are high in compounds known as Bioflavonoids.
These compounds are powerful anti-inflammitories. Bioflavonoids are also noted to help blood vessel walls strengthen and lessen bleeding. This could be another source of the relief. Chiles are also cited by nearly every homeopathic and home remedy book to be able to reduce inflammations. Chiles are believed by many peoples to achieve this effect through a normalising of blood pressures and blood flows in the body. Chiles are also noted to be relatively high in magnesium. Some time ago, bananas were touted as the ultimate cure for PMS when it was found that potassium helped to relieve the symptoms associated with PMS. Magnesium comes from the same family on the periodic table and could potentially mimic this effect.