Your IUD may not be causing hair loss. Instead, a plethora of other conditions could be causing this issue. Before making assumptions, it’s important to see a doctor and inspect your overall health for any other potential hair loss culprits. The most common causes of hair loss include: Hypothyroidism or hyperthyroidism, aging, general malnutrition, chronic stress, chemotherapy, some blood thinners, some antidepressants, pregnancy, menopause, rapid weight loss, and specific hair treatments.