Ginger may slightly reduce pain in some people with knee osteoarthritis, but the evidence remains mixed and not strong enough to make it a standard treatment for the joint.
Ginger does have biological effects related to inflammation, and in randomized trials, supplementation reduced several inflammatory markers in the blood, most notably C-reactive protein, tumor necrosis factor-alpha, and interleukin-6.
Ginger may slightly lower blood pressure, but its effect has not yet been studied well enough to use ginger as a stand-alone treatment for hypertension.
Ginger may slightly reduce fasting glucose and glycated hemoglobin in people with type 2 diabetes, but the evidence is not yet strong enough to use it as a treatment for diabetes.
Ginger is credited with two almost opposite properties: some sources claim that it increases appetite, others that it reduces hunger and helps you eat less.
Taking ginger after meals may subjectively reduce heaviness or nausea in some people, but there is no convincing evidence that taking it after meals improves digestion.
Ginger may help some people with bloating, but there's insufficient evidence for specific bloating. Studies show that ginger can speed up gastric emptying and influence gastric motility.
Ginger can indeed influence gastrointestinal function, but the phrase "improves digestion" is too vague. In small human studies, ginger powder accelerated gastric emptying and increased gastric contractions.
