Kindly refer to the following link(s):

Difference between Sadaqa and Zakat 

Illness / Sick

Giving sadaqa when faced with an illness 

Can we give sacrifice of an animal when someone falls sick?

Charity for a Sick person: Slaughtering a sheep or giving Cash? Which is better?

What are benefits of charity Sadaqa 

Frequently giving Charity 

Is giving charity on behalf of others and many people valid?

What is Sadaqa Jariyah (Continuous or Ongoing Charity)?

Is Charity (Sadaqa) given in Makkah have more rewards than given in other places? 

Can we eat from our own Sadaqa