To try to do something that is very difficult–especially when an obstacle prevents the achievement of a goal– is to struggle. You can use this word as a verb or as a noun for situations that require great effort.
These sentences show how "struggle" can be used as a verb:
Juan struggled to finish all of his work on time.
Kate struggles with her addiction to cigarettes.
We watched a fisherman struggle with a very large fish that was on his line, but he lost it.
A fox caught in a trap struggled to free itself, but it couldn’t do it.
The young woman is still struggling with the death of her mother.
The people affected by the war are struggling every day to survive.
These sentences show how "struggle" can be used as a noun:
On some days it’s a struggle for Steve to wake up in the morning. He suffers from depression.
Martin Luther King Jr. led the struggle for civil rights in the 1950s and 1960s in the United States.
The struggle against racism, prejudice, and discrimination in the United States continues.