was tun wenn der stuhl zu hart ist — what are common causes?

Common causes of hard stools (constipation) include low fiber intake, inadequate hydration, lack of physical activity, and certain medications (e.g., opioids, iron supplements, antidepressants). Ignoring the urge to defecate or an imbalanced gut microbiome can also contribute. Underlying conditions such as hypothyroidism, irritable bowel syndrome, or intestinal obstructions are less common but should be considered. Evidence-based first steps are increasing soluble fiber (e.g., psyllium husk, oats) with sufficient fluid (1.5–2 L/day) and regular exercise. If symptoms persist >3 months or are accompanied by blood, weight loss, or severe pain, medical evaluation is required. The provided context does not address stool hardness; this answer is based on established medical guidelines.