Question

Whats are symptoms of dieseases like night blindness, rickets, beriberi, anaemia, scurvy?

Answer 1

Night blindness: Inability to see in the dark.

Rickets: Bones becomes thinner.

Beri beri: Muscle weakness.

Neuritis: Temporary vision loss and pain.

Scurvy: Fatigue and bleeding in gums...

Anaemia: Intense fatigue caused by anaemia

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Answer 2

causes of night blindness ;

SIGNS OF
NIGHT BLINDNESS

Your optician will be able to diagnose night blindness.
 Symptoms of nyctalopia include; weak vision in dim light, difficulty seeing when driving at night and slow reaction time between bright and dim light conditions. Driving at night can be a particular challenge, due to the intermittent presence of headlights and streetlights on the road.

RELATED
EYE CONDITIONS

While a condition in it's own right, night blindness may 
be the result of a related eye problem, listed below.

Astigmatism - With astigmatism, when lighting dims, your pupils dilate to let in more light creating more blur than you would in daylight. 

Diabetes - Poor night vision can be an early sign of diabetes. High blood sugar is harmful to the blood vessels and nerves in the eye. A symptom of diabetes is retinopathy, where the back of the eye is gradually damaged. As a result, adjustment to light, such as coming indoors from bright light outside, is slowed. 

Cataracts - With cataracts, you'll notice that oncoming headlights cause more glare than before as you'll be more sensitive to light. 

Retinitis Pigmentosa - A group of inherited vision disorders which lead to the progressive degeneration of the retina. Deteriorating night vision is often the earliest symptom. Over time, the peripheral (side) vision gradually decreases. 

Symptoms of rickets include:

pain or tenderness in the bones of the arms, legs, pelvis, or spinestunted growth and short staturebone fracturesmuscle crampsteeth deformities, such as:delayed tooth formationholes in the enamelabscessesdefects in the tooth structurean increased number of cavitiesskeletal deformities, including:an oddly shaped skullbowlegs, or legs that bow outbumps in the ribcagea protruding breastbonea curved spinepelvic deformities