The risks for each procedure are listed below, these risks are uncommon in most elective operations and more common in emergency surgery. You can reduce the risks and complications by refraining from smoking and losing weight if your BMI is over 30:

Varicose Vein Surgery and Foam Sclerotherapy -   scars, pain, allergy, infection (1%), bleeding, bruising (1 month), lumpiness (1-2 months), phlebitis, recurrence (20% in 5 years), nerve damage, clots in the deep veins 1% DVT and 0.1% PE), transient shortness of breath and visual disturbance (rare), chronic pain and numbness (rare), stains (rarely permanent), stroke 1/5000, heart attack, and risk of anaesthetic.

Botox injections for excessive sweating - pain, allergy, infection (1%), bleeding, bruising, lumpiness, recurrence 6-12 months, nerve damage and arm weakness, chronic pain and numbness (very rare) and risk of reaction to local anaesthetic cream.

Hernia Surgery - scars, pain, allergy, infection (1%), bleeding, organ damage leading to major surgery (very rare), bruising (1 month), lumpiness (1-2 months), recurrence (1%), nerve damge, clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), urinary catheter for retention (more common with prostate enlargement in the elderly) and risk of anaesthetic.

Lump and Bump Excision - scars, pain, allergy, infection (1%), bleeding, bruising (1 month), lumpiness (1-2 months), recurrence, nerve damage, clots in the deep veins DVT and PE, chronic pain and numbness (rare), stains (rarely permanent) and risk of anaesthetic.

Laparoscopic Cyclist Endofibrosis Surgery - scars, pain, allergy, infection (1%), bleeding, organ damage leading to major surgery (very rare)  bruising (1 month), lumpiness (1-2 months), recurrence, nerve damage, clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), mortality 1/500, limb loss 1/500, fasciotomy 1/200, wound herniae, failure of procedure to improve exercise performance, conversion to open surgery and risk of anaesthetic.

Laparoscopic Aneurysm and Endoleak Surgery - scars, pain, allergy, infection (1%), bleeding, organ damge leading to major surgery (very rare)  bruising (1 month), lumpiness (1-2 months), recurrence, nerve damage, clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), mortality 2-15% depending on fitness, limb loss 1/500, fasciotomy 1/200, wound herniae, failure of procedure to prevent endoleaks, renal failure, stroke, heart attack, bowel ischaemia, paraylsis (rare), conversion ot open surgery and risk of anaesthetic.

Carotid Surgery - scars, pain, allergy, infection (1%), bleeding, bruising (1 month), lumpiness (1-2 months), recurrence, nerve damge, clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), mortality 1% depending on fitness, stroke risk 5-7%, failure of procedure to prevent stroke, heart attack and risk of anaesthetic.

Leg Bypass Surgery - scars, pain, allergy, infection (1%), bleeding, organ damage leading to major surgery (very rare)  bruising (1 month), lumpiness (1-2 months), recurrence, nerve damge, clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), mortality 1/100, limb loss 1/25, fasciotomy 1/100, failure of procedure to improve exercise performance, heart attack, stroke and risk of anaesthetic.

First Rib and Cervical Rib Resection for Thoracic Outlet Compression Syndrome - scars, pain, allergy, infection (1%), bleeding, organ damage leading to major surgery (very rare)  bruising (1 month), lumpiness (1-2 months), recurrence, brachial plexus and nerve damage (rare), clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), mortality 0.5% depending on fitness, limb loss 1/1000, fasciotomy 1/500, failure of procedure to prevent original symptoms, pneumothorax and chest drain, haemothorax and thoracotomy, thoracic duct leak, seroma and risk of anaesthetic.

Arterio-venous fistula surgery for Dialysis - scars, pain, allergy, infection (1%), bruising (1 month), lumpiness (1-2 months), recurrence, nerve damage, clots in the deep veins 1% DVT and 0.1% PE), chronic pain and numbness (rare), mortality 1/100, limb loss 1/25, fasciotomy 1/100, reduced arm exercise performance, heart attack, stroke, failure of fistula 40% and risk of anaesthetic.

What to look out for after surgery:

Infection - areas of redness are not always infection, they may be inflammation which should settle with anti-inflammatory cream or tablets. Infection of a wound or incision is associated with a painful warm raised area and possible pus with a pyrexia (temperature above 37.5 degrees C). Any possibe infection should be checked by your GP or Surgeon or a member of the surgical team. 

DVT or PE - blood clots in the deep veins of legs (DVT) cause severe swelling with redness of the calf or thigh or both with pain. A blood clot in the lung (PE) caused chest pain and shortness of breath. Both of these conditions are emergency and require A&E attendance for anticoagulation

Nerve Damage - rarely nerves can become trapped in scar tissue or damaged by an incirion which will creat numbness around the scar or shooting pains along the scar and into the local area. Usually these symptoms subside of a period of months and usually resolve after 1-2 years. Occasionally steroid injections are required to the scar to resolve the problem.

Phlebitis - in approximately ten percent of patients after varicose vein surgery or foam injection the treated vein can become inflammed after 3-4 weeks. This is best treated with anti-inflammatory cream, heparinoid ointment and wearing a compression stocking, it is best to have the area assesed by your surgeon or GP.