When Hormones and Diabetes Collide: Understanding Catamenial Diabetic Ketoacidosis

Diabetic ketoacidosis (DKA) is a medical emergency in which the blood becomes dangerously acidic due to a severe lack of insulin. It usually develops when someone misses insulin doses, faces a major infection, or experiences significant physical stress.

But a case reported in 2026 describes something different: a young woman with Type 1 diabetes who experienced recurrent episodes of DKA specifically during the 3–4 days before her period—and had no obvious explanation. Doctors found no infection, no missed insulin doses, and no other typical warning signs. Her blood glucose soared to 560 mg/dL, and her blood became acidic (pH of 7.24), yet the usual culprits were absent.

The case suggests that hormonal changes during the menstrual cycle may influence how the body uses and responds to insulin. This pattern is sometimes called 'catamenial' DKA because it occurs in relation to the menstrual cycle (catamenia is a medical term for menstruation).

While this appears to be an unusual presentation, it highlights a broader truth: the menstrual cycle can affect blood sugar control in people with diabetes. Estrogen and progesterone fluctuations may alter insulin sensitivity—how efficiently the body's cells respond to insulin—making blood sugar harder to manage at certain times of the month.

The woman in this case required emergency treatment with intravenous insulin, fluids, and potassium replacement. She was then switched to a basal-bolus insulin regimen (a combination of long-acting and rapid-acting insulins) to better manage her condition.

Her case underscores an important lesson: healthcare providers and people with Type 1 diabetes should consider menstrual cycle timing when troubleshooting persistent blood sugar swings or unexpected episodes of DKA. Adjusting insulin doses or monitoring patterns around the menstrual cycle may help prevent serious complications, especially in settings where medical resources are limited and preventive care is critical.

If you have Type 1 diabetes and notice patterns in your blood sugar—such as higher glucose levels, increased insulin resistance, or worsening symptoms—around the time of your period, it is worth tracking and discussing with your healthcare team. Keeping a simple log of blood glucose readings alongside your menstrual cycle can reveal valuable patterns.

While catamenial DKA appears rare, the underlying principle—that hormones affect diabetes management—is well established. Your provider may recommend adjusting insulin doses at specific points in your cycle or using continuous glucose monitoring to better understand your individual pattern. Open communication about these patterns is essential for safe, personalized diabetes care.

Source: Frontiers in endocrinology. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.