There is no reliable scientific evidence to suggest that taking Prilosec causes cancer. Prilosec (Omeprazole) is a proton pump inhibitor (PPI) commonly used to treat and reduce acid in the stomach for those suffering from gastroesophageal reflux disease (GERD). Reports suggest that long-term use of PPIs could increase a person’s risk of developing certain types of cancer. This is likely due to the reduction of stomach acid, which can affect the absorption of important nutrients or potentially help harmful compounds like nicotine and alcohol penetrate into the digestive system more easily. One study published by the National Institutes of Health did find that long-term Prilosec users had an elevated risk of developing stomach cancer. However, there is no established causal link between the two and further research needs to be done. Another study found that long-term use of any kind of PPI (including Prilosec) could also increase the risk of esophageal cancer, although it did not reach significance in the dataset. In conclusion, there is no solid evidence to suggest that taking Prilosec causes cancer. Long-term use of PPIs in general may be associated with an increased risk of certain types of cancer, but the science is still uncertain. It is still important for patients to seek advice from their doctor when taking any medication.