Hemorrhoids can be caused by various factors such as constipation, diarrhea, and prolonged sitting. To prevent them, it is recommended to maintain a healthy diet high in fiber, stay hydrated, avoid straining during bowel movements, and take breaks from sitting for long periods of time. The best treatments for hemorrhoids include over-the-counter creams, suppositories, and sitz baths. If symptoms persist or worsen after 28 days, it is important to consult with a healthcare professional for further evaluation and treatment.