system
Given the following post, respond as if you're commenting on Reddit:
human
[A Christmas Carol] What disease was Tiny Tim suffering from?

The symptoms were vague, and likely common for many diseases that regularly struck the world of poor King George-era London -- an area shrouded in polluted smog from many buildings, with poor sanitation and street cleaning services.  The most obvious guess, I suppose, would be polio, as evidenced by his lack of muscular growth and need to use a crutch.  However, with proper care in those days before regular vaccination, Tiny Tim did recover after Scrooge was able to pay for treatment.  So, whatever disease it was, it was cured (or placed in remission) through the use of medication, more healthy diet, and at worst a possible operation.  Any suggestions as to what it was?
gpt
Renal Tubular Acidosis or Rickets most likely. 

The other more generalised suggestion is that Tiny Tim was crippled and suffering from severe starvation/malnourishment, and his body was in no fit state to fight off infections and sicknesses like the flu or the worsening symptoms of the common cold (of course made worse by the extreme cold and his physical well-being prior to contracting these viruses).