Diseases that spread by the same means or have the same cause:

Introduction:
There are various diseases that can spread through similar means or have the same underlying cause. Understanding the common modes of transmission or shared causes can help in implementing effective preventive measures and treatment strategies.

Group A: Goitre, Anaemia, Scurvy
- Goitre: Goitre is a condition characterized by the enlargement of the thyroid gland, leading to a swelling in the neck. It is commonly caused by a deficiency of iodine in the diet.
- Anaemia: Anaemia refers to a decrease in the number of red blood cells or a decrease in the amount of hemoglobin in the blood. It can be caused by various factors, including iron deficiency, vitamin B12 deficiency, or certain chronic diseases.
- Scurvy: Scurvy is a condition caused by a deficiency of vitamin C. It is characterized by symptoms such as fatigue, weakness, swollen and bleeding gums, and poor wound healing.

Group B: Dengue, Malaria, Night blindness
- Dengue: Dengue is a viral infection transmitted by the Aedes mosquito. It is characterized by symptoms such as high fever, severe headache, joint and muscle pain, and rash.
- Malaria: Malaria is a mosquito-borne infectious disease caused by the Plasmodium parasite. It is characterized by recurrent fever, chills, and flu-like symptoms.
- Night blindness: Night blindness, also known as nyctalopia, is a condition characterized by difficulty seeing in low light or at night. It can be caused by vitamin A deficiency or certain genetic disorders.

Group C: Cholera, Typhoid, Allergy
- Cholera: Cholera is a bacterial infection caused by the Vibrio cholerae bacterium. It is primarily spread through contaminated food or water and can lead to severe diarrhea and dehydration.
- Typhoid: Typhoid fever is a bacterial infection caused by the Salmonella typhi bacterium. It is primarily spread through contaminated food or water and is characterized by high fever, abdominal pain, and gastrointestinal symptoms.
- Allergy: Allergies occur when the immune system overreacts to normally harmless substances, such as pollen, dust, or certain foods. Allergies can manifest as various symptoms, including itching, sneezing, rashes, or difficulty breathing.

Group D: Beri-Beri, Malaria, Pellagra
- Beri-Beri: Beri-Beri is a disease caused by a deficiency of thiamine (vitamin B1) in the diet. It is commonly associated with a diet consisting mainly of polished rice and can lead to symptoms such as weakness, fatigue, and peripheral neuropathy.
- Malaria: As mentioned earlier, malaria is a mosquito-borne infectious disease caused by the Plasmodium parasite.
- Pellagra: Pellagra is a disease caused by a deficiency of niacin (vitamin B3) in the diet. It is characterized by symptoms such as dermatitis, diarrhea, dementia, and ultimately,