Ginger is an antihistamine which helps to fight against bacteria which causes cold. 
Here's how to use Ginger to treat cold and cough:

1) Ginger Lemon Juice and Honey: 

Ingredients: 
1) Fresh Ginger 
2) 1/2 Cup of Lemon Juice, 2 Tablespoon of honey and 2 cups of boiling Water. 

Method: 
1) Use 3 inch of fresh ginger and chop it finely 
2) Take a bowl, add 1/2 cup of lemon juice, 2 tablespoons of honey and 2 cups of boiling water
3) Stir the consistency well and cover it with plastic and leave it for 10 minutes 
4) Strain the solution and drink it consistently. 

Article Courtesy: Curejoy 

Masthead Courtesy: honeyandbeauty