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Is this problem with your ribs since birth or recently. Usually this is known as pectus excavatum
which is a disorder which is usually present since birth. It may not cause any majoy health problem by itself unless there is gross disturbance in taking breath and discomfort associated. If you have fever
, breathing difficulty orr chest pain
it would be better to get a checkup by your Doctor. Also if you have less calcium in diet the ribs can become soft and deformed. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. Eat high protein and calcium diet like cereals, pulses, chicken, eggs, lean meat. For breathing difficulty try steam inhalation. Do visit your Doctor as soon as you can.