Glossary | Cancer Research UK
Cancer Research UK on Google+ Cancer Research UK on Facebook Cancer Research UK on Twitter
Skip navigation


View glossary terms beginning with ...

  1. A
  2. B
  3. C
  4. D
  5. E
  6. F
  7. G
  8. H
  9. I
  10. J
  11. K
  12. L
  13. M
  14. N
  15. O
  16. P
  17. Q
  18. R
  19. S
  20. T
  21. U
  22. V
  23. W
  24. X
  25. Y
  26. Z
  27. [0-9]
  1. Ha
  2. Hb
  3. Hc
  4. Hd
  5. He
  6. Hf
  7. Hg
  8. Hh
  9. Hi
  10. Hj
  11. Hk
  12. Hl
  13. Hm
  14. Hn
  15. Ho
  16. Hp
  17. Hq
  18. Hr
  19. Hs
  20. Ht
  21. Hu
  22. Hv
  23. Hw
  24. Hx
  25. Hy
  26. Hz
  27. H0-9

List of terms beginning with Ha


A rare, slow growing type of brain tumour that develops from blood vessel cells in the brain. It is almost always benign.


A non cancerous (benign) tumour in the blood vessels of the skin, making the skin look red or pink. Some look like birthmarks.

Haematological malignancies

Haematological malignancies are cancers of the bone marrow or lymphatic system, where blood cells are made. They include leukaemia, lymphoma and myeloma. Normally, blood cells are produced in a controlled way. In these cancers, too many blood cells are made and the cells don't work properly.

Haematological response

This is a way of describing how well your treatment has worked for some types of blood cancer. It means that following treatment your blood counts have gone back to more normal levels.


A doctor who specialises in treating blood disorders, including leukaemias, lymphomas and myeloma.


A swelling where blood has collected under the skin.

Haematopoietic tissue

The tissue where the blood cells are made. The bone marrow in adults.


Haemochromatosis is also called iron overload disorder. It is a genetic disorder in which the body absorbs too much iron from the diet. The iron then builds up in various organs, such as the liver, pancreas, heart, endocrine glands, and joints. The iron damages the liver and it becomes bigger and does not work so well.


A pigment containing iron. It is found in red blood cells and carries oxygen around the body.

Haemolytic anaemia

Haemolytic anaemia is a type of anaemia caused by the abnormal breakdown of red blood cells, either in the blood vessels (called intravascular hemolysis) or elsewhere in the body (extravascular haemolysis). It can be caused by other medical conditions and blood disorders or by some medicines or types of infection. People with haemolytic anaemia have low levels of red blood cells, which can cause a faster heart rate, breathlessness, chest pain (angina), weakness and looking pale. Some people may have jaundice. The breakdown of red cells can also lead to gallstones and high blood pressure in the arteries of the lungs.

Haemorrhagic cystitis

Inflammation of the bladder with severe bleeding.

Hair follicles

The sacs in which the hairs grow from the scalp. The hair follicles are damaged by some chemotherapy drugs and biological therapy drugs, so they can cause hair loss or hair thinning.


Bad smelling breath

Hand-foot syndrome

This is a side effect of some cancer treatments, including some chemotherapy drugs or biological therapies. The skin on the palms of the hands and the soles of the feet goes red and peels. The redness and peeling clears up when the treatment is finished. It is also called palmar-plantar erythema, which means red palms and soles.

Updated: 29 June 2016