Hi Cristina.This is the vocabulary about Unit 4!

                           ACHES AND PAINS:

Allergic reaction: It is the answer of our body agains an allergen.
Broken leg: It is the fracture of one of our lowers extremities.
Aching muscles: When we feel pain in your muscles.
Dislocated shoulder: When your shoulder is out of it position.
Itchy skin: When you have to scratch your skin.
Sore back: When you feel pain in your back.
Swollen ankle: When your ankle is amflame. 

                 PHRASAL VERBS:

Cheer up: To make someone feel happier.
Work out: To do exercise.
Cut down: To reduce the amount of something.
Chill out: To Relax Completely
Face up to: To accept that a difficult situatin exists.
Calm down: To make someone feel better when he or she is not very well.
Open up: To begin to trust in someone.
Slow down: To take the things with more calm.