Peter S. Hsu is an immunologist based in Westmead, NSW, Australia. He works with people who have problems with their immune system, as well as some related conditions that can show up again and again over time. In many cases, the goal is to work out what’s going on and help plan care that fits real life, not just test results.
As an immunology doctor, Peter looks after patients across a broad range of immune-related issues. This can include primary immune deficiencies, where parts of the body’s defence system don’t work as they should. At times, that can show up as frequent infections, long-lasting symptoms, or unusual types of illness. He also helps with conditions linked to immune balance, such as autoimmune problems, where the body’s immune system can turn against its own tissues.
Some patients see him for immune conditions that affect the lungs and breathing, including asthma. Others come in because of allergies. Food allergy is one example, but there are also immune issues that can cause strong allergic-type reactions or gut and skin problems. Over time, the pattern of symptoms matters, so the work usually involves careful checking and making sure the right tests are chosen for the right questions.
Peter also supports people dealing with more complex or rare immune syndromes. These may involve hormone issues, skin and nail changes, severe allergies, or other body systems being affected. He may be involved in care for people with conditions like APECED (Autoimmune Polyendocrinopathy-Candidiasis-Ectodermal Dystrophy), Autoimmune Polyglandular Syndrome Type 2, and hyper IgE syndromes. Immune conditions such as Chronic Granulomatous Disease and Common Variable Immune Deficiency also fall under the kind of problems his clinic care is connected to.
In some cases, the immune system issue links with cancer or other serious complications, such as Hairy Cell Leukemia (HCL) or Kaposi sarcoma. He is also connected to care where immune defects are present from early life, including DiGeorge syndrome, Severe Combined Immunodeficiency (SCID), and immune defect due to absence of the thymus. There are also situations like Kaposi sarcoma, Kikuchi disease, and even rare vascular or blood pressure related problems, where immune and inflammation can play a role.
Peter’s practice includes a wide spread of conditions, so appointments are often about sorting out the story, understanding how symptoms fit together, and deciding on next steps. Even with rare diagnoses, the focus stays practical: steady assessment, clear communication, and support for patients and families through the process.