Ginger is an herb. The rhizome (underground stem) is used as a spice and also as a
medicine. It can be used fresh, dried and powdered, or as a
juice or
oil.
Ginger is commonly used to treat various types of "stomach problems," including motion sickness, morning sickness,
colic, upset stomach, gas, diarrhea,
nausea and vomiting after surgery, as well as loss of appetite. Other uses include treating upper respiratory tract
infections,
cough, and bronchitis.
Policegoudra RS, Aradhya SM, Singh L.
Mango ginger (Curcuma amada Roxb.)--a promising spice for phytochemicals and biological activities. 1. J Biosci. 2011 Sep;36(4):739-48. 
Mango
ginger (Curcuma amada Roxb.) is a unique spice having morphological resemblance with
ginger but imparts a raw
mango flavour. The main use of
mango ginger rhizome is in the manufacture of pickles and culinary preparations. Ayurveda and Unani medicinal systems have given much importance to
mango ginger as an appetizer, alexteric, antipyretic,
aphrodisiac, diuretic, emollient, expectorant and laxative and to
cure biliousness, itching,
skin diseases, bronchitis,
asthma, hiccough and
inflammation due to injuries. The biological activities of
mango ginger include
antioxidant activity,
antibacterial activity,
antifungal activity, anti-inflammatory activity, platelet aggregation inhibitory activity, cytotoxicity, antiallergic activity, hypotriglyceridemic activity, brine-shrimp lethal activity, enterokinase inhibitory activity, CNS depressant and analgesic activity. The major chemical components include
starch, phenolic acids, volatile oils, curcuminoids and terpenoids like difurocumenonol, amadannulen and amadaldehyde. This article brings to light the major active components present in C. amada along with their biological activities that may be important from the pharmacological point of view.