Anyone can have an allergic reaction to the fish and may start to sweat, develop a rapid pulse and feel nauseous as the poison gets further into the body. Some people collapse as a result. Others can develop chest pain, although the sting is not fatal. People who have been stung should take painkillers and if they develop an allergic reaction to the sting, a course of antihistamines is recommended. Other common poisonous fish on Britain's beaches include jellyfish and the stingray, which, if disturbed, can use its tail to venomous effect. But fish are the least of your worries on the beach. The force of the sea is much more dangerous than anything swimming about inside it. Over the weekend, two people nearly drowned in the Bournemouth area after getting out of their depth swimming. One was just 16 years old. They are both now in stable condition in the hospital. We were much more hit by that than sunburn cases where the message seems to be getting home': said a spokesman for the Royal Bournemouth Hospital. In other areas, the situation was less dramatic with a handful of sunburn and sprained ankles reported in other sunspots, including Cornwall, Blackpoll and Brighton. Coastguards are warning the public not to swim if there is a red flag flying on a beach and to find out about local tides and currents.