<s>[INST] Occasionally when I have been laying down resting for a long time...like when I am watching a movie ..and then after the movie is over I stretched and suddenly my heart feels like it is beating very hard but not fast.....this also occurs occasionally after eating chinese rice....I dont have amy known heart conditions or allergies, I dont drink caffinated beverages except for tea..Im 28 [/INST] Hi welcome to Chat Doctor forum.  Thanks for choosing Chat Doctor. Forum.  You are 28 years of age.  If you get up after a long rest, and getting up you feel like your heart is beating very hard but not fast. Also occurs after eating Chinese rice, occasionally. You have no heart problems or allergies.  The causes for such symptoms are anemia, gastric hyperacidity, anxiety, etc. I advise you to consult a physician for diagnosis and treatment. You may need to have DIGITAL X RAY, besides other routine tests for confirmation.  Wishing for a quick and complete recovery.  Best regards. </s>