Calciphylaxis: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Calciphylaxis?
Calciphylaxis is usually treated by a nephrologist, a kidney doctor, together with a dermatologist, a skin doctor. Treatment often also involves wound care teams and pain specialists. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is calciphylaxis?
Calciphylaxis, also called calcific uremic arteriolopathy, is a rare but very serious disease. Calcium builds up in the walls of tiny blood vessels in the skin and fat. The vessels then narrow or get blocked. Blood can no longer reach the skin. The skin gets hurt and can die, and painful open sores form.
It is a highly fatal condition. In some studies, more than half of patients die within one year. Most deaths are due to sepsis, a body-wide infection. The disease can also reach organs inside the body, such as the eyes, lungs, brain, muscles, and intestines.
Symptoms
The main sign is an extremely painful skin lesion. Common features include:
- Skin lesions that start as reddish-purple lumps or firm raised patches.
- Open sores called ulcers. Dead tissue called eschar, a dark crust, may form on them.
- Lesions on body parts with more fat, most often the belly, thighs, and buttocks.
- Mottled or net-like skin coloring called livedo reticularis.
Because the skin is broken, infection is common. It is the leading cause of death in calciphylaxis, and the risk of sepsis is high.
Causes and who gets it
The exact cause is not known, and many factors likely play a part. Most cases happen in people with advanced kidney disease. This is very true for people on dialysis, a treatment that filters the blood when the kidneys cannot. Rarely, it can happen in people with normal kidneys.
Risk factors include obesity, diabetes, liver disease, cancer, immune diseases such as lupus, and an overactive parathyroid gland, the gland that controls calcium. Medicines linked to it include warfarin, a blood thinner, steroid drugs, iron, calcium-based phosphate binders, and a strong form of vitamin D.
How doctors diagnose it
Doctors start with the health history and a physical exam. To confirm the disease, they do a skin biopsy. This means taking a small piece of skin to look at under a microscope. The sample shows calcium in small blood vessels, and often blood clots and damaged tissue. Doctors may also test the blood. Lab work often includes a metabolic panel and tests of liver function and blood clotting. Keeping calcium and phosphorus in a safe range is part of care. At times doctors skip the biopsy, because it can cause new wounds.
Treatment
There is no single proven cure, and treatment usually needs a team. A calciphylaxis team may include a nephrologist, dermatologist, wound surgeon, wound nurse, pain management specialist, and palliative care team. Main parts of treatment include:
- Changing dialysis settings and stopping calcium pills and high-calcium dialysis fluid, to keep calcium and phosphorus in a safer range.
- Sodium thiosulfate, a medicine given through a vein, usually during dialysis visits. In one group study, more than 7 in 10 patients who got it saw their skin lesions improve or go away. Side effects include a chemical imbalance in the blood and too much fluid in the body.
- Cinacalcet, a medicine that lowers parathyroid hormone, for people whose parathyroid gland is overactive.
- Stopping medicines that may play a part, such as warfarin, but only when a doctor weighs the risks and benefits.
- Wound care and pain control. Dead tissue may be removed in a procedure called debridement. Antibiotics are used when the wounds get infected.
- Hyperbaric oxygen therapy, breathing pure oxygen in a pressurized chamber, has helped some wounds heal.
When to see a doctor
Tell your kidney team right away about a painful skin lesion, a reddish-purple patch, or an open sore that will not heal, especially if you have advanced kidney disease. Call 911 if you have signs of sepsis, a body-wide infection that can kill. These signs are confusion, shortness of breath, fever or shivering, clammy or sweaty skin, or a fast heartbeat or weak pulse.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either can set up the many specialists this disease needs, track wounds and lab work between visits, and help manage long-term care.
Common questions
Is calciphylaxis life threatening?
Yes, it can be. The outlook for most patients is poor. In some studies, more than half of patients die within one year. Infection that turns into sepsis is the most common cause of death. Treatment needs a team of specialists working together.
Can calciphylaxis happen without kidney disease?
Yes. Most cases happen in people with advanced kidney failure. But it can also develop in people with normal kidneys or earlier stages of kidney disease.
Does sodium thiosulfate work?
It may help, but it is not proven. It is now routinely used off-label. This means it is not officially approved for this disease. In one group study, more than 7 in 10 patients saw their skin lesions improve or go away. No large controlled trials have tested treatments for this disease yet.
Why does it hurt so much?
The blocked vessels cut off blood supply to the skin. The damage and open sores are very painful. The pain often does not ease with regular pain medicines, so pain specialists often join the care team.
Sources
- NIH National Library of Medicine - Calciphylaxis (StatPearls)
- NIH Genetic and Rare Diseases Information Center - Calciphylaxis
- CDC - About Sepsis
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
