A bruised rib is an injury to the rib, in which small blood vessels are torn and leak blood under the skin but the rib bone is not fractured. Because the bruise, also called a contusion, is on the rib it often cannot be seen although the injury that causes it may also cause bruising on the skin in the area of the bruised rib.
Most of the time, a bruised rib will heal on its own within two to six weeks.
What Are Symptoms of Bruised Ribs?
It may be difficult to tell if a rib is bruised or broken because symptoms can be the same, and may include:
- Intense pain in the chest area
- Pain may be worse when inhaling, coughing, or sneezing
- Swelling or tenderness around the affected ribs
- Bruising on the skin
Seek immediate medical care if you have:
How Are Bruised Ribs Diagnosed?
A bruised rib is diagnosed with a patient history and physical examination.
An X-ray is usually not needed because bruising would not be visible, however, if a fracture is suspected an X-ray may be needed.
What Is the Treatment for Bruised Ribs?
Bruised ribs usually heal on their own. Home remedies to help relieve pain and speed healing include:
- Rest
- Stop any activity that causes pain
- Protect the injured or sore area
- Ice the affected area regularly for 10 to 20 minutes at a time for the first few days to reduce swelling
- After two to three days, if swelling is gone, use a heating pad on low
- Take over-the-counter (OTC) pain medicines
- Acetaminophen (Tylenol)
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Ibuprofen (Advil, Motrin)
- Naproxen (Aleve)
- Avoid NSAIDs for the first 48 hours as they may slow healing
- Sleep sitting up for the first few nights if possible
- Breathe normally
- Walk around and move the shoulders to help you breathe
- Cough when you need to
- Avoid:
From 
Healthy Resources
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https://www.nhs.uk/conditions/broken-or-bruised-ribs/