1t is the uncontrolled and unwanted growth of cells.
Cause:
(i) No definite cause has been arrived at so far. However, it is found that body
has proto-oncogenes. These are activated by some substances or stimulus,
which convert these into active cancer-causing oncogenes.
(ii) Heavy smoking and alcoholism.
(iii) Chewing of tobacco.
(iv) Consistent irritation of skin or repeated injury at the same point.
Cancer is a kind of tumorous growth. Tumours can be classified into two categories :
(a) Benign tumour
It remains confined to the place of origin and does not spread to other body parts.
It is relatively harmless.
(b) Malignant tumour
It spreads to other parts of the body and growth is rapid. This is serious and may
cause death of the patient.
Symptoms:
(i) Persistent lump or thickening in tissues, specially in tongue, breast and uterus.
(ii) Any irregular bleeding or blood-tinged discharge from any body opening.
(iii) Any sore that does not heal quickly.
(iv) Change in the form of mole or wart.
(v) Persistent hoarseness in voice, cough or difficulty in swallowing.
Prevention and cure
(i) Cancer check up should be done once a year.
(ii) Treatment should be taken under medical advice.
(iii) Avoid smoking, taking alcohol and chewing of tobacco.
(iv) Observe regularity in life style to keep body healthy.
5. Allergy
(i) Includes a group of non-infectious diseases.
(ii) No definite cause is known
(iii) It is believed that they occur due to hypersensitiviness of certain individuals
to foreign matter (allergens) which may enter inside the body.
(iv) Symptoms may be sneezing, gasping, running of eyes, irritation of throat or
trachea, etc.
(v) Allergens may be pollen grains, feathers, some animals or insects, drugs,
medicines, odour etc.
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