Is allergic purpura dangerous?

Written by Li Jing
Rheumatology
Updated on June 04, 2025
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Firstly, allergic purpura is a type of hypersensitivity reaction and also a specific type of vasculitis. The main triggering factors include infections, medications, and food allergies, among others. It is not curable and tends to recur. Allergic purpura can be categorized into skin type, joint type, abdominal type, renal type, and mixed type. The presence of black stool, hematuria, vomiting, or proteinuria often indicates abdominal or renal types, which are the most severe forms of allergic purpura. In cases of black stool and severe vomiting, it is crucial to eat timely, replenish fluids, and maintain electrolyte balance. Additionally, it is important to complete a mesenteric vascular ultrasound to check for mesenteric vascular embolism. Moreover, if hematuria and proteinuria occur, it is necessary to rest in bed and, if needed, perform a kidney biopsy to assess the extent of kidney damage. Allergic purpura can be life-threatening because if not treated promptly, it may lead to purpuric nephritis, which can cause symptoms like proteinuria, hematuria, and even hypertension and bodily edema. In severe cases, it may lead to renal failure and induce uremia, greatly harming health. Furthermore, children with allergic purpura may also develop serious complications such as intussusception, which can be life-threatening. If this condition is identified, surgical treatment should be administered promptly.

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Written by Pan Wu Shan
Nephrology
1min 6sec home-news-image

Is allergic purpura nephritis easy to treat?

Allergic purpura nephritis is essentially a kidney complication caused by allergic purpura. The main symptoms are that the patient first presents with scattered purple spots on the lower limbs, known as allergic purpura. Subsequently, routine urine tests reveal hematuria or proteinuria, allowing for a diagnosis of allergic purpura nephritis. It cannot be completely cured. Currently, treatment first requires complete quantification of urine protein and a renal biopsy to confirm whether it is allergic purpura nephritis and its severity. Generally, it involves the use of steroids. Typical treatment involves firstly avoiding allergens, so any substances that cause allergies should not be contacted to prevent triggering allergic purpura, and thus prevent the recurrence of purpura nephritis. Additionally, it involves adhering to a low-salt, low-fat diet, and avoiding catching colds or staying up late.

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Written by Zhou Qi
Nephrology
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Is allergic purpura nephritis contagious?

Henoch-Schönlein purpura nephritis and allergic purpura are not infectious diseases; there is no contagious element involved. Henoch-Schönlein purpura nephritis is actually kidney damage caused by allergic purpura, which is an allergic disease itself. Patients suffer from an abnormal immune response in the body’s immune system after coming into contact with allergenic drugs or foods, leading to necrotizing vasculitis. This disease is unrelated to pathogens. Generally, there is no direct damage to the kidneys caused by a specific pathogen in this disease, nor do patients carry pathogens that can cause Henoch-Schönlein purpura nephritis, such as bacteria or viruses, thus making the disease non-contagious.

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Written by Li Liu Sheng
Nephrology
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Is allergic purpura nephritis contagious?

Kidney damage caused by allergic purpura is called allergic purpuric nephritis. The main mechanism of allergic purpuric nephritis is the deposition of immune complexes in the kidneys, causing hematuria, proteinuria, edema, and hypertension. Severe cases of purpuric nephritis may also lead to renal failure. Additionally, patients with allergic purpuric nephritis exhibit systemic symptoms such as skin purpura, abdominal pain, joint pain, and melena. Allergic purpuric nephritis usually occurs in children, and it is not contagious. Unlike viral hepatitis, tuberculosis, and dysentery, it does not spread through respiratory, digestive, or blood pathways.

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Written by Li Jing
Rheumatology
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Can allergic purpura be cured?

Allergic purpura is a common vasculitic hypersensitivity response, which means that it is a vascular inflammatory response caused by allergies and is particularly prevalent among adolescents, with a higher occurrence in males. Most cases are associated with infections or allergies, with the most common infections being bacterial, viral, parasitic, and mycoplasmal. Seafood and high protein can lead to allergies, triggering allergic purpura. This condition cannot be cured and tends to recur, but as individuals age and their immune system strengthens, the frequency and likelihood of episodes significantly decrease. However, if kidney damage occurs, which means the development of allergic purpura nephritis, it is crucial to regularly monitor kidney function and urine routine to check for the presence of proteinuria. If necessary, cardiac puncture should be performed, and corticosteroids should be administered.

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Written by Zhang Peng
General Surgery
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Is allergic purpura with abdominal pain easy to treat?

Allergic purpura with abdominal pain, also known as abdominal allergic purpura, involves gastrointestinal symptoms associated with allergic purpura, primarily characterized by episodic severe abdominal pain, usually around the navel or lower abdomen, and may sometimes be accompanied by vomiting. Treatment typically involves bed rest, actively identifying the cause, controlling infections, and supplementing relevant vitamins. It's also important to check for any symptoms of gastrointestinal bleeding. If there are signs of gastrointestinal bleeding, strict dietary management is necessary, blood transfusions may be required when needed, and the healing of the gastrointestinal tract must be monitored. Medications to suppress acid or protect the gastric mucosa could be considered. Generally, the prognosis for allergic purpura is favorable, though very few severe cases may experience gastrointestinal complications such as bleeding, intussusception, or even necrosis. Although the prognosis is generally good, relapse is common. (Please use medications under the guidance of a professional physician and do not self-medicate.)