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High Pressurer
If you're watching the weather and you see an "H" on the map, that's an area of high pressure. It has greater pressure than the area around it. Air under that system is moving towards the earth and getting warmer, keeping clouds away. That's why it's generally sunny in high pressure areas.
Low Pressure
In areas with low pressure (indicated by an "L" on the map), pressure is lower than the surrounding area. Air is moving upward and cooling. As warmer air cools, humidity becomes water through condensation--or even ice. It then falls to earth as precipitation--thus low pressure is often connected with storms.
Effects on Fishing
Many fishermen believe that changes in the humidity can alter the feeding habits of fish. In high pressure, fish won't swim as fast and will be more cautious. More enticing lures and baits are needed if you want to get your normal catch. In times of lower pressure, if it's cloudy but not yet rainy, fish can be bolder, and you can work with lures at a shallower depth, moving them at average speed. Fish are most active when pressure is headed downward.
Effects on the Body
Many doctors who treat arthritis have patients who encounter pain in the joints when the weather changes. According to MedicineNet, a well-known 1961 study found that low barometric pressure and high humidity produced a higher degree of stiffness and joint pain in arthritis patients. The theory used to explain this was that swelling in joints would expand when air pressure went down.