Urbanization (living conditions)
Urbanization caused cities to grow and disease to spread.
No sewer system.
There were no sewer systems so the waist lined the streets in which children played and some family's lived in. Therefor disease was emanate.
To meany people.
There were to many people in the crowed housing of the slums. Pore family had only an out house or basement to live in. Sometimes twenty family's shared one toilet. This and the lack of sanitary workers caused diseases like typhoid, measles,and cholera to spread.
Cleaning up the city
After the start of major outbreaks of diseases The London Board of Health decided to make the Metropolis Water Act of 1852 it forced water companies to move their intakes upstream and regulate their filtration and storage.
conclusion
As you can see cities were disgusting and unsafe places to live for most people