Goodevening my friend is suffering of swollen and...

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What are the causes of painful and swollen legs ?

1.deep vein thrombosis
2.inflamatory process as cellulities 
3.lymphatic obstruction 
4.chronic disease as heart kidney and liver disease
5.rheuamtoid disease and iflamatory process of joints 
6.backer cyst below knee

What are the treatments ?

1.low molecular weight heparin 
2.aspirin protect
3.intravenous antibiotic for cellulities
4.surgery to remove the obstruction 
5.treat headt disease liver and kidney disease
6.cotisone and immunosubressant drugs 
7.surgery to remove cysts and other lesions 

What are the ivestigations to do ?

1.CBC
2.doppler ultrasound with colour flow 
3.kidney function test
4.liver enzyme 
5.D dimer